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consider visiting the National Arboretum in Washington, D.C. It is a research institution for the improvement of plants through introduction, breeding, and selection. It not only conducts research on . trees, shrubs, and herbaceous plants, but also educates the . public. It is part of the USDA and is open to the public free of charge.
• Insecticidal soaps can cause browning of leaf margins and brown or yellow spots on leaves of some plants, especially if the plants are stressed from repotting or transplanting. Some varieties of begonias, impatients, geraniums, fuchsias, gardenias, and nasturtiums show sensitivity to soap sprays. Test for sensitivity by treating a small part of the plant, then checking the plant several times over the next two days. If a test plant wilts, rinse it off with water and do not use soap spray on that cultivar.
• To make old hay and manure weed-free, spread them on the soil in late winter, water well, and cover with black plastic. Weed seeds will sprout after few days of warm weather, than will be killed by frost and lack of light.
• If bird feeding has been a favorite activity this winter, order trees and shrubs that provide cover and small fruits for your feathered friends. Consider species such as crabapple, hawthorn, holly, dogwood, and pvracantha that can help lure hungry birds from cultivated fruits, if planted on the opposite side of the yard.
For additional information on these gardening tips or readers with related gardening questions, call the Extension Office at 675-3619.
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