NEIGHBORHOOD GARDEN FOR SEPTEMBER 8

NEIGHBORHOOD GARDEN FOR SEPTEMBER 8, 2007

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FALL PRUNING

BY GEORGE EDGAR

September is not a good month to do a lot of pruning on shrubs and deciduous trees (trees that lose their leaves in the fall). Deciduous trees can be pruned after they have lost all their leaves and have gone dormant. But the best time to prune them and fruit trees is in late February or early March. Conifers can be pruned, if needed, after you are sure they have gone dormant, which will be after a couple hard freezes (temps in the low 20’s). Pruned in mid-December the branches of conifers are good for Christmas arrangements and wreaths.

Butterfly bush (Buddlia davidii) may be pruned this fall after it goes dormant, or I like to wait and see what winter kills and prune next spring. Then, remove only the dead wood. My Star Magnolia (Magnoliaceae stellata) bush already has big flower buds, so I only prune it after blooming in the spring. Magnolia trees and shrubs need very little pruning. The biggest problem with a Magnolia is protecting those flower buds over the cold winter and from a late frost.

Your hybrid tea, grandiflora, Old English (David Austin), and floribunda roses bloom on new wood so they can be pruned after a couple hard freezes (temperatures in the lower 20’s or colder). I usually just top my roses (about 24”-30”) so they do not blow in wind. I then store my large tomato cages over the top and put wood chips around them for the winter. I do not do this until after the ground has frozen which is usually around Thanksgiving. The purpose of the mulch on the roses and other perennials is not to keep the ground warm but to keep the ground cold and avoid the freezing and thawing. More trees, shrubs, and plants are winter killed by the freezing and thawing that takes place in the winter and early spring, than by the cold temperature. DO NOT prune most climbing roses as they bloom on old wood. Pruning now will remove flowers for next year. Next spring prune only those canes that have winter killed.

DO NOT prune most spring blooming shrubs in the fall, such as lilac, forsythia, bridal wreath spirea, and flowering almond. If you prune the shrubs now you will be cutting off the flowers for next year. Prune these spring blooming shrubs right after they bloom by taking out 1/4^th to 1/3^rd of the biggest, oldest canes all the way to the ground. This will reduce the height of the plant and open it up. This method also helps to control insect damage and especially lilac borers as they like the old, weak canes. Thus by pruning you help get rid of the borers. Also by pruning you have a new bush every 3 to 4 years and more flowering throughout the bush.

As I mentioned above, DO NOT prune fruit trees, most deciduous trees, and most conifers (evergreen) trees and shrubs between the first week in August and the time they go dormant which is after Thanksgiving. Pruning encourages new growth and this new growth usually does not mature and winter kills.

DO NOT APPLY ANY DRESSING SUCH AS TAR, PAINT, OR WOUND DRESSING TO THE CUT SURFACE. Research has found that trees do better when left to heal naturally. Drying out from the cold winds when the ground is frozen is also a problem for conifer trees and shrubs that have already set their flower buds. Spraying an anti-desiccant or an anti-transpirant like “Wilt Pruf” really helps. Do this about Christmas time on a day when the temps are above 40 degrees F.

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TIME TO PUT YOUR AMARYLLIS TO BED

BY GEORGE EDGAR

If you want your Amaryllis to bloom at Christmas time you should start about the first week in September to force it to go dormant. They need a nap of a minimum 6 to 8 weeks. To force dormancy, put the pots on their side on the patio to dry out. After the leaves have died and turned brown, cut off the foliage and put the pots in a cool place for the winter. Store in a location that does not get above 55-60 degrees F. Also, do not store in an unheated garage or any location where the bulbs might freeze.

If the plant has been out in the soil for the summer, dig it with roots intact, let the plant dry out and turn brown. Then take the old leaves off and put the bulb in a container for its mandatory rest of at least 6 to 8 weeks. The container can be a pot, or a box filled with peat moss, vermiculite, sand, or sawdust. If your plant has babies, you can separate the bulbs at this time or wait until you take them out of storage.

I have other plants that are blooming in the house during and after Christmas so in the fall I let the first light frost hit my amaryllis plants to get them ready for a minimum 6 to 8 week nap. Most of my amaryllis are then kept sleeping until spring, and planted in the garden with the other lilies. If you do this they will bloom along with the other lilies in early summer.

If you want to force a bloom for late January or February, bring the plant out of storage after it has had its mandatory 6 to 8 week nap. When you put it into a pot, select one that is only 1 or 2 inches larger than the bulb, thoroughly soak the soil, and place in a warm sunny location. Add just enough water occasionally to dampen the soil. If the plant is already in a pot and you see a green shoot coming up, take it out of storage, thoroughly soak the soil, and as above, place in a sunny location and water only occasionally. It will take 6 to 8 weeks before you get a bloom. Do not fertilize amaryllis until the flower is done blooming.

When planting outside, you can either leave them in the pot or plant the bulb directly in the ground. Amaryllis are heavy feeders so fertilize with a water soluble fertilizer every two to three weeks during the summer. This builds up the energy in the bulb so you will have a large flower next year.

For more information about amaryllis, pruning, or any horticulture question, contact your local County Extension Educator for information or check the internet at “http://ianrhome.unl.edu/search”. In the top box scroll down to Extension publications. In the bottom box type in the name of the plant, shrub, flower, or tree, you want to grow, or the name of the insect, or disease you want to treat or control. A list of publications will appear. Read the ones of interest and download to the computer or print what you want to file and save. Also this site is excellent for securing information about what to plant where so it does not become a pest.