Seed Germinating Time

Q. I saved the seeds from last year’s tomatoes and pepper plants. When would it be a good time to start the seeds, so I can transplant them into the garden in May?

A. When germinating flower or vegetable seeds, I’d allow six to eight weeks between sowing the seed and planting in the open ground. Hence, I’d be sowing the seed in early March. However, if these were hybrid varieties, it’s not worth the effort and you’ll be disappointed. You only want to save and replant open-pollinated varieties. The seeds saved from hybrid flowers and vegetables varieties are unpredictable. The chances they are duplicates from last year’s varieties is not very good. It’s all about genetics, so I’d start with new plants. If not, the first thing to do is check to see if the seed is viable. Viable seed means it is capable of germinating. This is easily accomplished by pouring the seed into a glass of water or a larger receptacle. You discard the seed that floats on the surface and plant those that sink. The viable seed is dried out by spreading it over a paper towel and covering it with a second sheet. Next, sow the seed into a flat of pre-moistened potting soil, moist like a wrung-out sponge. With a pen or pencil, you make furrows in the soil, sowing the seeds in the rows and then cover the seeds. The flat is then covered with plastic to trap the moisture and heat. Once the seedlings start to emerge from the soil, remove the sheeting and place the flat in an area that gets morning sun. The seedlings are transferred to individual pots when they get two sets of true leaves. Some gardeners prefer to sow seed directly into individual pots and there is nothing wrong with that. But, I prefer the other method as it allows me to select and grow the most vigorous seedlings.

Note: May is an excellent time to plant vegetables, especially tomatoes and peppers. It’s not unusual for summer vegetables to struggle with cool and damp weather in March and April. So, there is a real advantage by waiting until May to plant.

Q. Last year, I planted cucumbers and was disappointed. They had a bitter, odd taste to them. A neighbor suggested that they were being pollinated by the squash plants growing near them? Will moving the squash to a different location solve this problem?

A. The problem will not be fixed by relocating the squash plants. Squash and cucumbers can’t cross pollinate as the genetic structure of the two plants are very different. Only members of the same species can interbreed. Squash will cross pollinate with other squashes, melons and pumpkins. This brings us to the next fallacy of this old-wives tale. If the two plants could cross breed, would it affect the current year’s fruits? The answer to this is also,” no.” When two plants cross pollinate, the results are unknown until the following year when you grow the saved, seed. Now this is a mute point if you plant new plants each year. Thus, cucumbers, squashes, melons and pumpkins can grow a side by side with no problems.                                                                  

The bitterness in cucumbers is due to a naturally occurring compound called cucurbitin. All cucumber plants contain varying amounts of this compound that is triggered by environmental stress. Environmental stress comes from high temperatures, heavy soil that is too wet, dry, and/or drains poorly, low fertility, insects and foliage diseases. Many times it is a combination of many of these factors. However in the Bay Area, I believe that uneven or irregular watering contributes to the problem. This is particularly a problem when the growing season has below-normal temperatures in the spring, coupled with rapid changes in temperatures from mild to hot during the summer months. This is what we saw last year as April was beautiful, May was below normal and then we hit triple digits on June sixth.  We then had triple digit heat spells in July, August and September. Bay Area gardeners tend to water with the same frequency regardless of the temperature. Yes, we water more when it’s hot but never less when the temperatures go below normal. The other factor is the soil preparation. Overall, it’s pretty minimal for our adobe, clay soil. Soil amendments must be added yearly in the spring to replenish what was lost last year. In addition, mulching is encouraged in vegetable gardens to even out the moisture and insulate the surface roots from the sun. Also, overly mature or improperly stored cucumbers may also develop a mild bitterness; however, it’s often not severe.

Note: The cucurbitin is often concentrated at the stem end of the vegetable and in the light green layer under the skin of the cucumber. You can limit the bitterness by peeling cucumbers from the blossom end toward the stem end and cutting off the last inch. It is best to rinse your peeling knife after each slice so as not to spread the bitter taste.

Azalea, Potato Vines and Bougainvillea

Q. My Potato Vine and Bougainvillea suffered from frost in the recent cold spells. Most of the leaves have fallen off, so they look terrible. Is there anything I can do now to help them grow back?                      

A. It’s not unusual for Potato Vines and Bougainvillea to be damaged from frost and freezing temperatures during the winter. The cold will burn the leaves and or kill the plants. Cold acts as a desiccant pulling moisture from the plant tissue while a freeze causes the cell walls to rupture. As a result of these damaged cell walls, the plant defrosts too quickly, killing leaves and stems. Cold injury is more likely to occur the longer the temperature stays below thirty-two degrees after the sun rises. Right now, the recommendation is to do nothing. There is the possibility of more cold temperatures going forward. Instead, I’d wait until the danger of frost is over which is around March 15. You could also scratch the bark to see if it’s green. This would indicate that the plant is still alive. Personally, I’d still wait longer until you see some new growth developing. At this time that I prune off all the dead growth and fertilizer with Dr Earth Organic all Purpose plant food to encourage the new growth.

Q. I have an Azalea that has been in the ground for twelve years and it’s not growing. When I planted it originally, I didn’t disturb the roots. I’ve since learned I should have. Can I now dig it up, spread the roots and replant it in the same spot? It has tremendous sentimental value.

A. Yes, I would replant. Your Azalea is slowly strangling itself, so you need to break the circular pattern of the roots for the plant to survive. March is an excellent month to dig up plants, trim their roots and then transplant. Even, if you’re going to replant it in the same location. This technique is called “Root Pruning.” Root Pruning is also recommended for container plants such as citrus, Japanese Maples, roses and many other plants that have been in the same container for over twenty-four to thirty-six months. In your case, I’d dig around the plant with a round nose shovel until you gently lift the root ball out of the ground. It should come out quite easily as there is should be little rooting into the native soil. With a sharp knife or pruning saw, trim away two to three inches off the sides and remove three to four inches off the bottom of the root ball. Before replanting, soak the root ball in a bucket of water with Liquinox Starter with B1 or similar product. Liquinox Starter with Vitamin B-1 helps promote feeder root growth and reduces transplant shock. The root ball should be held down under the water until the water stops bubbling. This forces all the air out of the root ball ensuring that it’s saturated. The new planting hole should be two and half times as wide as the original root ball and six inch deeper. This is to accommodate the many surface roots. The native soil is amended with organic matter or you could use one of the prepared planting mixes for shade loving plants at a 50/50 ratio. Next, center the Azalea in the hole with the top of the root ball one half inch above the soil surface. This allows for settling and prevents the plant from being planted too deep which is a critical planting mistake made by many. Two week after transplanting, I’d begin fertilizing with an Azalea, Camellia and Rhododendron Food and continue feeding it monthly until October.

Q. Last November, I planted garlic for the first time. It is now almost twelve inches tall. When does it mature?

A. Garlic should not mature for another three to four months. As harvest time approaches, the plants will turn yellow and brown. When forty percent of the foliage has discolored, you stop watering the plants and bend the foliage over, parallel to the ground. Once the foliage turns completely brown, the garlic is manually removed. I’d loosen the soil with a spading fork first and be careful as garlic bruise easily.



Berries, Sage & Seeds

Q. I’m going to replace several struggling roses. Should I plant patent or non-patent varieties? I’ve been told that the patent varieties are better performers than the non-patent?

A. The Plant Patent Act of 1930 introduced intellectual property or patent rights for plants. It allows plant breeders to recover their development costs from “asexually propagated” plants, aka roots, divisions and cuttings and not seeds. This includes fruit trees, roses, and today ornamental trees and shrubs. Nearly half of the 3,010 plant patents issued between 1930 and 1970 were for roses. Jackson & Perkins, Armstrong Roses, Weeks, and Conard-Pyle contribute to a staggering share of U.S. plant patents. Anyone who wishes to propagate and distribute the variety must purchase a patent tag for each plant from the hybridizer. Although we see new varieties every year, they are not developed over night. A new introduction is the result of many, many years of trial and error. The patent tag cost varies greatly between varieties. It could be anywhere from a quarter to several dollars. After seventeen years, the patent expires and it becomes a non-patent variety. Now, anyone can reproduce it free of charge. The rose is the same whether it’s a non-patent or patent variety. Newer rose varieties are more resistant to diseases than the old timers. Today, hybridizers are cross breeding resistant varieties from previous years for the new varieties of the 21st century. I’m always curious as to the parentage of each years’ new introductions. It gives me a clue as to how a particular variety will perform in our varied microclimates. The rose care product of today will effectively control the rose diseases so I’d use some other characteristic as my primary focus in selecting varieties.

Q. I’m going to purchase several Blackberry and Raspberry plants to grow on a fence. How much sun do they require, do I feed them when they are transplanted and will they bear fruit this coming summer or next summer.

A. Blackberry and Raspberries are a wonderful addition as long as the plants are contained; hence, they are not advisable for every garden. They require six hours of sunlight per day, April through October. However, you do not want to plant any berry vines on a fence that is also the property line. It can be an expensive nightmare dealing with a neighbor(s) disputes as the vines will intrude next door. Berry vines are aggressive growers with above and below ground stems or rhizomes. Instead, grow the vines on a separate trellis structure that is four to six feet off any fence line. This way you can head off the problems before it’s too late. If possible, I would place the trellis in a north south direction. This will allow the berries to ripen on both sides of the vines. Blackberry and Raspberry vines should produce fruit next year as the berries are produced on the second year canes. The vines are best pruned after you finish harvesting all the berries. The fruiting canes are cut off at the ground. You replace them on the trellis with the best of the new shoots growing from the base.  All the other new growth is removed. You need to be diligent with pruning off the basal shoots otherwise the vines can get out of hand. Again, the berries will only develop on the second year canes. At the time of planting, I would add Starter Fertilizer along with amending the soil with homemade compost or soil conditioner.

Q. The cold has damaged my Mexican Sage plants. Is there a right or wrong time to prune them back? I’d like to maintain them year round as they provide a colorful, feeding environment for Hummingbirds

A. It’s not unusual for Mexican Sage to turn brown from the winter cold. I’d expect this to happen every year. My pruning preference is to wait until the end of February or the beginning of March to prune them; however, it can be done at any time weather permitting. Mexican Sage produces all of its new growth from the base of the plant. It produces no lateral branches and blooms on the terminal end of each shoot. It should be back in bloom around Memorial Day and continue through the first cold night. Thus, I’d prune it off at the ground with a pair of hand or electric hedge shears. You should also clean out all of the fallen debris that has gather during the past growing season.  And in March, feed them with Doctor Earth Organic All Purpose Plant Food to encourage the new growth. This feeding should be sufficient for the entire year.

Tomatoes, Pears and Grape Vines

Q. Every year, I harvest some of my green tomatoes from the frost hoping they’ll ripen indoors, but they never do. I usually place them in the sun on the window sill but eventually I end up throwing them out. How can I successfully ripen them this year?

A. Leaving tomatoes out to ripen in the open air doesn’t work as you’ve found out. You can ripen tomatoes off the vine in a shallow box with a lid to create a simple ripening chamber. The bottom of the box is lined with a one-inch layer of newspaper and you place the tomatoes next to one another but don’t let them touch each other. A second layer can be added, separated with another layer of newspaper, but no more. The box is then place in a cool out of the way location like the garage. Every five to seven days, you open the lid a remove those that have turned red. The chamber traps the ethylene gas which is given off by the tomatoes. You can hasten the ripening by adding an apple or other fruit that releases ethylene. I know an old school method would have you wrap each tomato separately in newspaper or other material and store them in a box. I think it’s tedious and the lid makes that unnecessary. You should select tomatoes that haven’t been damaged by the cold. So, it may be too late for this year but I’d still try few anyway to get a feel for the technique.

Q. I have two Flowering Pear trees planted on the same day exactly three years ago. One turns color in late October while the other is just turning color now. Why don’t they color up at the same time?

A. Flowering Pear, Pyrus calleryana, is a deciduous ornamental flowering pear. Bradford, Whitehouse, Aristocrat, Redspire, and Capital are some of the varieties available today. The Flowering Pear was first introduced and bred for the purposes of creating a fireblight resistant variety. Unfortunately, this never materialized as they are also susceptible to the disease. They’re typically a pyramidal trees with vertical branching and rapid growth that is both tolerant of dryness and pollution. They produce beautiful white flowers, deep green summer foliage, and red to purple fall color. The three inch white flowers cover the trees complete in late February or March so it resembles a huge powder puff.

There are two possible answers to your question.  One could be they’re different varieties which I don’t think is the case and the other is how they were propagated. Plant genetic dictates the timing as to when the leaves turn color along with many other characteristics. The green dominant pigment in growing plants is produced by chlorophyll. The other leaf colors are only apparent when plants stop growing. Those started from seeds are very unpredictable while cuttings mirror its mother plant. So, it’s very possible your trees came from trees with different coloring time periods although the same variety. The time period when the leaves turn color in the Chinese Pistache tree is between four to five weeks; however, it’s much broader with a Flowering Pear.  It’s not unusual to see an individual tree in a row of Flowering Pears to show color starting in late August with the rest progressing through mid December. Also, there is no way to tell for sure whether it will color up early mid season or late ahead of time.

Q. Will I harm next year’s crop of grapes by cutting back old, ugly branches now?  I did that last year and had very few grapes this year.                  

Senior man pruning a wine grape vineyard in his garden

A. January/February is the traditional time of the year to prune grapes. However, they can be pruned earlier if you choose. Grapes are dormant once the leaves start to turn color and drop off. In the fall, the green leaves are storing energy and food for next year so you don’t want to remove them too early. Pruning grapes early does not affect the production. Improper pruning by cutting off the fruiting spurs is the primary cause for little to no grapes. Grape vines are a vigorous grower that produce lots of stems and leaves each year. For many, it’s a confusing mass to prune, especially if there are no defined vertical trunk and laterals. Grapes need to grow on a trellis structure with one main trunk and several lateral branches. A typical fence is not necessarily the ideal trellis for grapes. With time, the fence is damaged by the growth. Poor air circulation increases problems with diseases and the vines are difficult to maintain. Also, your neighbor may not appreciate the vegetation growing on his or her side.  A separate trellis structure off the fence improves the maintenance and disease issue besides avoiding a neighbor dispute. In preparation I’d watch several of the videos on You Tube. This should give you a good idea if you pruning technique needs to be modified. Google “spur and cane pruning grapes.” 

Note: There are two methods of pruning grapes, cane and spur pruning.   Here is a variety list as which pruning method is the best.

Compost and Crepe Myrtles

Q. My huge crepe myrtle tree used to bear beautiful, deep fuchsia flowers, but twelve years ago, the tree broke in half. Since then, it has never flowered again; instead, the leaves of the whole tree turn a bright red. What must I do to get it to flower again? What do you think happened to this tree?

A. Crape Myrtles do not stop blooming just because the structure of the tree has been damaged. They bloom only on the terminal ends of the new growth formed in the spring. This is why the trees are so colorful because all the color is at the end of the vegetation and in many cases covering the foliage. You’ll never find any flowers in the interior area of the canopy. Once it finishes flowering, the seed develop in the form of a green, round, structure that then turns brown when mature. The structure shatters, distributing the sterile seeds which are then pruned off in the winter. Thus, when a tree produces little to no growth you get little to no flowers. To stimulate the growth, fertilize in March and late May with 16-16-16. I’d apply a half a pound of fertilizer per inch of trunk diameter measured two feet off the ground. It should be applied around the drip line of the tree. The first application could be made earlier after the tree has been pruned. The red foliage indicates there other problems influencing growth, but I’m not sure what they might be. The red color should only be seen in the fall prior to leaf drop. I’d have an arborist evaluate the situation to determine what other problems are occurring. 

Q. I’m about to empty my compost bin as it’s nearly full. If I dig the compost into my garden now, will the winter rains leach out the valuable nutrients? In addition, should I mulch my roses now or wait until after they have been pruned?

A. The winter rains shouldn’t leach the nutrients from your compost. Compost is organic matter that is broken down by the soil microbes or organisms into nutrients that plants can use. The activity of the soil microbes is slowing down with the shorter days and the soil cooling off. Right now, you have several options. You could dig it in now or spread the compost over the top as mulch and dig it under in the spring. If you don’t have the time to do either, save the compost by storing it in plastic bags or large garbage can. With roses, I wouldn’t be inclined to spread it around until after they have been pruned at the earliest. You end up losing a portion of the material when you clean up the left over debris under the bushes. Mulching roses is usually done in May.

Q. I have been successful in growing papaya from seeds. One of these trees is now quite large and has fruit on it. When will the Papayas turn a yellow/orange color? Also, will the winter frost kill Papayas?

A. Yes, Papayas are damaged with our winter temperatures. They’re an evergreen, herbaceous plant, growing to twenty-five feet. Papayas are herbaceous because their trunks contain no woody tissue. The trunks are straight, hollow and rarely branched. This makes them more susceptible to freezing temperatures than other sub-tropical species like Citrus and Guavas. Often the foliage is just burnt by the winter cold. Eventually, we’ll have a very cold period that kills them. Our last killing frost was in 1990 so we’re due for one. For cold weather protection, I’d spray your Papayas with Bonide Wilt Stop or Cloud Cover. This also applies to Citrus, Hibiscus, Bougainvilleas, Mandevilleas and other cold sensitive plants. Wilt Stop and Cloud Cover puts a protective barrier on the leaf surface. I think of it as Chap Stick for plants. The next time freezing temperatures are forecast, cover them with a plant blanket at dinner time and remove it at breakfast. What happens next is up to Mother Nature. Papayas bear fruit at and early age. Flowering and fruiting occurs near the top of the plant in the leaf axils. The fruit turns a yellow/orange color in about eight months after pollination. Papayas are picked early because they bruise easily when ripe, much like pears. This is called the green mature stage. The fruit then has three additional ripening stages, evidenced by an increasing amount of yellow, beginning at the bottom of the fruit and working its way to the top. A ripe Papaya is predominantly yellow, has a light fragrance and yields slightly to pressure, much like an Avocado. A green papaya takes seven to ten days to ripen. You can increase the ripening time by putting them in a paper bag along with an ethylene-producing fruits such as apples or bananas. However, keep those fruits away when the papaya is fully ripe. Ripe papayas will keep in the refrigerator for up to a week but freezing them is not recommended as they lose their flavor when defrosted.

Peppers, Tulips and Deer

Q. I’ve been told that the sweetest bell peppers are those with four bumps on the bottom as they are the females. The “male” pepper has only three bumps. Is this factual? In addition, my red, mini bell peppers are now starting to turn a marbling color. They’re a combination of red, orange, and green colors and then start to shrivel up. Are they lacking something or just very confused?

Set of sliced red, green, yellow bell pepper section pieces isolated over white backgroundA. The number of bumps or lobes on a pepper is not an indicator of sweetness, nor the sex of a fruit. Peppers have both male and female reproductive structures in the same flower. They do not produce separate male and female fruits. The male flower is sterile. It’s the female that produces the fruit although some male flowers on a papaya have been known to set fruit. Genetics determines the number of lobes on a pepper. The four lobed ‘bell’ pepper is the most popular in the USA, so plants have been bred for this characteristic. Sweetness is another genetic characteristic. The sweetness in all sweet peppers increases as they mature. They start out green and change color as they ripen. The color depends on the specific variety; the most common variety is red when ripe. Red, yellow or orange sweet bell peppers start out green and turn red, yellow or orange when ripe. What can be confusing, is that there is also a variety that is green when ripe. Peppers shrivel up when they are over ripe and on the decline. So they need to be picked before this occurs. The green bell peppers you find at the store are usually an unripe green sweet bell pepper or it could be an unripe red. They will not be any of the other color varieties in the green stage because the other colors can be sold at a much higher price, so they are always allowed to ripen before being sold. The additional time it takes to ripen and change color accounts for the reason they are more expensive. Overall, you’re waiting too long to harvest the peppers, so pick them before they start to shrivel.

Q. My tulip bulbs have arrived from Holland. I’m planning on planting them in containers to give as Christmas gifts. What do I need to know about the soil preparation and/or potting these bulbs?

Traditional house with tulip garden in AmsterdamA. Tulip bulbs should be chilled for four to six weeks prior to planting unless the bulbs were pre-chilled before shipping; otherwise, the flower stems will be very short. Tulip bulbs are cooled by placing them in the vegetable bin of a refrigerator. You should remove any fruit including tomatoes as they release a naturally occurring gas called Ethylene that can damage the immature flower(s). In mid to late November, plant the bulbs in the containers using any of the commercially available potting soil. The planting depth will depend on the size of the container. The bulbs should be at the soil surface with any six inch or smaller container to allow room for the roots. With larger containers, you can move the bulbs down half way in the pots. A tablespoon of bulb food is place under the bulbs with a layer of soil between the fertilizer and the bulb. You now have two options as far as spacing the bulbs. They can be evenly spaced or placed next to each other. I prefer the later when using them as a gift or when planted in containers for color on decks and patios. By Christmas, it is very doubtful that the bulbs would have started growing. The addition of seasonal color will bridge the gap. Violas, Pansies and Alyssum can be planted in between the bulbs after you added more soil but be sure to leave sufficient room to water. I’d use straws to mark the gaps. The tulips will have no problem emerging through the roots and foliage. The finished containers are placed outdoors in a protected area and watered every two weeks. I would not put the finishing decorations on until the last minute. Beside the traditional items, you could use Pyracantha or Toyon berries along with some bark or decorative rock to make them festive looking.

Q. Our yard is sometimes visited by deer as we live next to a creek. One night a deer ate the foliage of a recently planted cherry tree. I’ve started using a dried blood based deer repellent around the trees and it has been effective in the past plus it’s also a mild fertilizer. Now, the new growth from the base has bore some fruit but they were plums. Are cherry trees grafted on to a plum root stock? Is it possible that we purchased an incorrectly labeled tree?

A. Yes, your cherry tree is budded on to a different rootstock but not plum. Cherry trees are budded on to a wild cherry rootstock called Mazzard. Mazzard is best suited for sweet and tart cherries but not sour or pie cherry varieties planted in clay soil. Plums are budded on to Myroblolan Seedling rootstock, as it is also adaptable to clay soil and root-knot nematode resistant. You also should have noticed a difference in the size of the leaves between the original tree and the new shoots from the base. Cherries have large leaves while plum leaves are noticeably smaller. Hence, your tree was mislabeled and I’d replant a new cherry. Blood Meal is an old time, organic fertilizer and deer repellant. It’s placed in mesh bags and hung in trees at the nose height of the deer.  The repellant effect is usually lost when placed only on the ground since it’s the smell that drives the animal away. In addition, you might ring the tree with chicken wire to form a cage, keeping the deer at a safe distance.

Trees, Water and Seeds

Q. The leaves on our forty-year old Fruitless Mulberry have been dropping. We don’t water it much as the shallow roots are growing in the lawn area. Do you think the canopy has outgrown its root system?

A. No, I do not think your Mulberry has out grown its root system as they’re not a short-lived tree. This is a drought related problem. In previous years, frequent lawn watering was sufficient to support a mature tree. However, dry winters, water restrictions and several triple-digit heat spells are showing its effect on mature landscape trees throughout the area. While you may have stopped watering your lawn, you should not abandon watering mature trees. They more than pay their way with the energy savings and the cooling effect from the shade along with the increase in property value. Trees with exposed roots and or shallow-rooted varieties such as Redwoods are susceptible to water stress. It’s not too late to take some positive steps this fall and to continue them next year and beyond. Mature trees should be watered every three to four weeks, June through October, depending on the temperatures. This is particularly important for those areas replanted or not planted at all. I’d mulch the exposed root area with a three inch layer of organic matter to replace the insulation effect from the previous lawn. You could use bark, compost or the natural debris from other plants along with shredded household paper. Also, be sure not to bury the crown or base of the tree with the mulch.  Next, under the canopy, set up a drip system or better yet use my personal favorite—a soaker hose, the grandfather of the drip irrigation systems. Soaker hoses offer a slow and steady release of water to your tree(s). The slow release allows the soil around tree roots to gradually absorb the water. And the proximity of the hose to soil means that very little if any is lost to evaporation. It’s tough to know how long you should run your soaker hose to get enough, but not too much, water into the ground. It’s recommended you apply six to eight inches of water per month in one or several waterings. The easiest way to calculate this is with a shallow container such as a tuna can. It’s placed under a section of hose and you see how long it takes to fill it up with one inch of water.  You then multiply that by six or eight to determine how long to run you hose. Once that’s determined, you automate the process with a Dramm Water Timer attached to your hose bib. With turf being replaced with water wise planting, mature trees are going to suffer unless measures are taken to replace the moisture the previous lawn provided.

Note: Here are two short videos produced by the Forest Service and California ReLeaf on how to water mature and young trees. They worth the viewing.  and

Q.  I purchased my tomatoes seeds online from the Burpee Seed Company. I germinated the seeds and transplanted twelve seedlings into my vegetable garden last spring. The plants have all prospered, however, five plants produced dinky, little, cherry like tomatoes instead of the desired large, slicing type tomato. What happen and what should I do next year to prevent it from recurring?Много разных семян овощей и цветов

A.  I do not believe anything culturally went wrong with your tomato plants. This is a simple case of human error. Flower and vegetable seeds are packaged by machine. When they change from each variety, the machine should be cleaned out of any remaining seed before resuming packaging. This apparently did not occur with your seed package so you ended up planting two different varieties. I’d write Burpee and explain the problem and ask for refund.

Q. We removed an old apricot and plum tree from our backyard. We’re planning to pour a cement slab over one spot and place a shed over the other. The stumps are below the soil surface and I’ve been digging out the other roots, but it’s a lot of work. If I leave the roots, will I have a problem with shoots growing through the cement and or shed floor?

A. It’s not necessary to remove all the roots. You should level the area and remove those roots in the area of the new pads. It is going to be difficult for roots to penetrate a cement slab as long as it’s poured correctly. I’d be concerned with cracks, especially from earthquakes, so you might pour a thicker slab than normal. Apricots and plums are budded on the same root stock that is notorious for suckering, so I’d expect that suckers will appear in the open area beyond the pads. Right now, there isn’t much you can do. You’ll have to wait for new shoots to develop and then spot treat them with a herbicide or remove them manually. Which herbicide you use will depend on where the shoots are and the location of desirable trees and shrubs. I wouldn’t be inclined to spray any herbicide on bare ground as it’s not a very effective control. You’ll need to be persistent as it will be a battle of attrition which you will win.


He Loves Me, He Loves Me Not

Q. When and how far back can I trim my daisy bush without damaging it? It’s one of the “He-Loves-Me, He-Loves-Me-Not” Daisies. I’d like to keep it at its current height of about three feet.

Abstract beautiful flower, colorful floral background , wet yellow petals border, daisy plant over red , nature at spring, macro detailsA. Daisies are best pruned in between flushes of flowers or in the spring of the year. Unfortunately, they always seem to be in bud or bloom so there is no perfect time to prune them. Hence, I’d trim them when the majority of the flowers are spent, realizing that I’ll be sacrificing some of the next flush of flowers. Trim the growth with a pair of hand pruners or use an electric hedge shears. I’d cut back the herbaceous or green stems avoiding the old woody portions of the plant. Plants trimmed back to bare stems are unattractive looking, and the pruning doesn’t encourage the lateral shoots. To keep it at three feet, you’ll need to prune it several times each year. Another option is not to prune it at all.  Instead, enjoy the endless flowers and when the plant out grows its space, remove it and replace it with a new plant. Daisy plants are not that expensive and grow back quickly.

Note: Marguerite Daisy or Euryops are sometimes referred to as the “He-Loves-Me, He-Loves-Me-Not Daisy. It gets its name from a story of a day dreaming young girl’s method of determining whether the boy in her dream is the love of her life. She would pick a flower and remove each petal saying, “He-Loves-Me, He-Loves-Me-Not,” alternating the phrase between each petal. The answer lies with the last Daisy petal. I’m not so sure it’s used very often today as this was from a more innocent times.

Q. Why are my New Guinea Impatiens disappearing overnight? Something is cutting them off at the base and carrying them away, as I find no evidence of the plants or any part of them anywhere around.

A. I’d strongly suspect roof rats. Roof Rats obtain much of their water requirement from their food or from free water such as sprinklers. Hence, they’re very fond of fruit, especially oranges and tomatoes as they mature. Water restriction have curved their water supply so they’re forging on other plants aka, New Guinea Impatiens. New Guinea’s are a herbaceous and succulent plant so they’re a perfect target. Roof rats generally begin searching for food shortly after sunset. These rats may cache or hoard considerable amounts of solid food, which they will eat later. These food caches may be located in a variety of other hiding places, generally near their nests. they’re very mobile, so they’re a tough problem to control outdoors. Traps would work but not baits as there are too many household pets that could be harmed. My suggestion is to move on and replant with something else.

Q. I purchased a bag of pure Mesquite charcoal for barbecuing. Can you tell me the origin of Mesquite?

A. Mesquite is a very interesting large shrub or small tree that is indigenous to the southwest and the desert areas. There are three common species of the Mesquite: Honey Mesquite (Proposes gladiolas), Screwbean Mesquite (Proposes pubescens) and Velvet Mesquite (Proposes velutina). Mesquite grows to forty feet high and is deciduous. It’s a member of the pea family and has the characteristic bean pods which have long been used by humans, wildlife and livestock as a food source. It is estimated that over seventy-five percent of a Coyote’s diet in late summer is from the mesquite beans. Native Americans relied on the Mesquite pod as a dietary staple from which they made tea, syrup and a ground meal called Pinole. They also used the bark for basketry, fabrics and medicine. A favorite of bees and other insects, the Mesquite flowers has a honey, fragrance. Mesquite has a true tap root which can go down in the soil forty feet deep looking for moisture. The tap root can be larger in diameter than its truck. It is the tap root that is used for firewood while the above ground parts are used for furniture or tool handles. The density of its wood fibers makes Mesquite an extremely hardwood. It’s a favorite with those who like to grill because the density causes Mesquite to burn at temperatures higher than most other charcoals. It also burns slowly and is smokeless sealing in the natural juices as the meat cooks.

Weeds, Tomatoes and Trees

Q. I’ve laid bark over landscape fabric for weed control following the instructions on the packaging. After four days, I was very surprised to find weeds growing right through the material. How do I get rid of the weeds? What can I do to prevent this from happening again?

A. To be effective, the bark or any other type of mulch should be at least two inches thick for weed control. The combination of the fabric and the mulch prevents light from reaching the soil. Without a light source, the dormant weed seeds can’t germinate. In the past, black plastic was used, however it did not allow the soil to breathe. Moisture was trapped under the barrier. Plants suffered from root rot from the excessive moisture. To correct the current situation, I’d spray the unwanted vegetation with Round Up and add additional mulch to prevent others from germinating. Many people believe that this will prevent weeds from ever being a problem again in this area. They are sadly mistaken when the weeds return. The landscape fabric will prevent only those weed seeds from germinating that is under it. It isn’t effective controlling any weed seeds above the barrier. Weed seeds move from area to area by the wind. As the hills turn brown, the seeds produce by the annual grasses and other plants are transported to new areas. Bark or any other mulch stored in open bins and delivered in bulk are more likely to have weed seeds than those packaged in bags. Over time the bark breaks down and become fine particles. It’s a perfect medium for seeds to sprouts and grow. Monterey Weed Stopper is a pre-emergent herbicide that sets up a chemical barrier that kills the weed seeds before they germinate. It’s too late to apply it once you see any growth. To keep the area weed free, be sure to follow the instructions on the label and don’t cultivate the area. If you do, you’ll have to reapply the material, as the barrier is broken.

Q. I have two tomato plants growing in large pots. They are doing well, in fact you can almost watch them grow. But, I’m a bit concerned because they are so very bushy. Should I strip some of the growth off or just let them continue on?

Tomato Plant in a Pot isolated on a white backgroundA. It is important for tomatoes to be bushy with lots of leaves. The foliage cover is a type of natural sun block protecting the ripening tomatoes from sunburn. Sunburn is a tan/beige spot that forms on the south and southwest side of the fruits. But, you can have too much of a good thing. I’d selectively thin out the inside, secondary shoots that forms were a leaf connects to a stem. The center of the plants become crowded and dense as they mature, especially when you’re using a tomato cage. This will let in more light and increases the air circulation throughout the plant keeping the inside foliage from turning brown. I’d repeat this as necessary. You should also be on the lookout for Tomato Hornworm. They like to hide out in the center of the plant and eat their way outward. When caught early  you can just pick them off or spray with BT or Captain Jack Dead Bug Brew.    

Q. I have several fruit trees; orange, cherry and plum, planted on a slope. They all have a basin but the water seems to run out before it sinks into the ground. How can I get the water to penetrate faster?

A. Watering basins are a must today with the ongoing water restrictions. With plants planted on a slope, they should be six to eight inches high on the downside to form a sufficient watering basin. A soil surfactant such as EZ Wet from Grow More, aids or increases the percolation rate, preventing erosion and water run off. EZ Wet makes water “better” at doing its job. It reduces water’s surface tension so it penetrates directly into the root zone, hydrating plants more effectively. It’s applied directly to the watering basin of trees and shrubs. For moisture retention, I’d spread a three inch layer of mulch in the basin and beyond. The cherry and plum are watered every three weeks while the orange is watered more frequently. Instead of using an irrigation system, I’d hand water your trees to make every drop count. The other application is with containers of Japanese Maples, Citrus, Roses, Camellias, and other ornamental plants as it prevents the water from rolling around the root ball and down and out the sides of the container. Soil surfactants are not new as they have been around of decades. They were widely used in previous drought periods. EZ Wet  should be applied every other month through November.

Drought Tolerance, Sheet Mulching, Liquidambers and Bamboo

Q. I’m looking to remove a portion of my lawn and replace it with drought tolerant plants. Is there a way, I can do this without removing the grass or using any chemicals to kill it? In addition, I don’t want to wait for the grass to die first.

A. Yes, there is a method of doing exactly what you described. It’s called ‘Sheet Mulching.’ Sheet Mulching is not new, and in fact it’s used by organic gardeners who utilize Permaculture. Permaculture is a philosophy of working with, rather than against nature. It’s a natural process that combines soil improvement, weed removal, and mulching in one fell swoop. It is currently being utilized by a whole new group of gardeners looking to replace their grass with plants. You’ll need cardboard and/or lots of newspaper along with an organic mulch.Stack of newspapers

First, scalp the grass by mowing it as low as possible. Next, dig the planting holes, amend the back fill, plant your plants and add starter fertilizer. A thick layer of cardboard and/or a half an inch of newspaper should then used to cover or smother the old lawn area leaving the plants exposed. A second option is to cover the entire area first before planting, and then cut holes in the paper or cardboard layer. Think of the cardboard or paper layer as an organic or biodegradable landscape fabric.

To prevent the material from moving or blowing around wet the layer down as you proceed. You should over lap the seams or edges by four to six inches to prevent any new growth or weeds from developing. BE WARNED: Sheet Mulching will not prevent germination of the weed seeds that blow in on top of the mulch. Wet the paper again with the existing sprinklers before applying the mulch because the moisture aids the decomposition. I recommend converting conventional sprinklers to drip irrigation, and then cover the area with a three inch layer of mulch and wet it. Be careful not to bury the new plants in the mulch! The entire conversion process should take a about day once all the materials have been secured.

Sheet Mulching’s other purpose is to turn barren or unproductive hard soil into new planting areas. This can be done in the open ground or within a raise bed. It will take several growing seasons for the whole process to be completed, but it is worth the time and energy. To revitalize your soil, first place a thick layer of cardboard and/or newspaper on the ground. Next, top it with eight to twenty-four inches of organic material, bark, straw, grass clippings, along with household kitchen waste. Spread the material evenly in alternating layers. Start small, as you’ll likely need a significant amount of organic material. This technique is often referred to as ‘Lasagna Gardening.’

Liquidambar Trees and Pollen

Q. When a Liquidambar starts to produce pollen? I’m trying to figure out if it could be the source of our daughter’s severe spring allergies. Help!

A. Liquidambar trees bloom in March. It produces both male and female flowers as two separate structures about the same time as the leaves are emerging from dormancy. Plant pollen moves around by insects and the wind. Wind pollination requires light pollen and lots of it that can travel great distances. This is the troublesome kind because it is abundant, easily inhaled and likely to cause allergic reactions. Flowers that depend on bees, wasps, butterflies, moths and beetles for pollination tend to produce heavy, sticky grains that are somewhat airborne. My gut feeling is that your Liquidambar is not the culprit.

Instead, there may be multiple sources based on the plants in your yard. Foundation plants, especially next to windows and doorway entries, can be an immediate source of problems to those predisposed to pollen allergies. Birch, Oaks, Cedars, Walnuts and Olives, as well as Junipers, Privets, Podocarpus and even Lilacs are problematical for those allergic to pollen.

My suggestion is to purchase a copy of Tom Ogren’s book Allergy Free Gardening. In Tom’s book, he has developed a system of rating plants based on allergy severity and sensitivity. The Ogren Plant Allergy Scale (OPALS) assigns plants, including edibles, a rating from 1 to 10, with 1 being the best for allergies and 10 being worst. Hopefully you can now identify the problem plant(s)! Of course, this assumes that you know the names of the plants in your yard. If not, take samples or high-resolution pictures to your favorite garden center and ask the nursery professional for help.


‘Hellish’ Heavenly Bamboo

Q. My Heavenly Bamboo plants are out of control. They’re small towers, standing about six feet tall and are quite top heavy, which causes the branches to sag away from the plant at extreme angles. Is there a problem with severely pruning them back to a much smaller size? In my neighborhood, I see several plantings that are much smaller.

A. The Sunset Western Garden Book describes Heavenly Bamboo, Nandina domestica, as a slow to moderate growing shrub six to eight feet high, spreading three to four feet. It has a clumping habit and spreads by shoots or runners. There are several options you can use to control the top heaviness and the spread. You can: stake the clump and tie the staggering stems to it with green plastic tape; cut off the top-heavy or all the canes at ground level as new shoots will appear from the base. The new growth can be sheared annually like a hedge to keep it the right height. You can also reduce the tree’s width by removing a section of the clump with a shovel. Finally, your last is too replace them with the shorter growing varieties. Nandina Domestica Firepower, Harbor Dwarf, and Sienna Sunrise are three varieties that do not grow beyond four feet. Heavenly Bamboo does not produce lateral shoots, so reducing the height is the best way to obtain a more shorter and compact plant.