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| Ian Robertson, Ltd. Horticultural Tips
December Tips q Plant container-grown, B&B, and bare-root trees and shrubs when the ground is not frozen or too wet. Always plant at the same level plants were grown at the nursery, or slightly higher. Top-dress with 2" of compost. q Do not plant Southern Magnolia or Cherry Laurel until late February or March. q Thoroughly water and mulch new plantings, keeping mulch away from the plant's trunk. q Add new mulch to existing beds if needed. q Prune broadleaf and narrowleaf evergreen shrubs to shape. Do not prune spring flowering shrubs or vines, except to remove dead, diseased or crossing wood. q Prune summer flowering trees and shrubs (that bloom on new wood) to force new shoots in the spring. q Prune giant hybrid Clematis severely now (if needed) up until new growth begins to emerge, and prune other deciduous summer-flowering vines as well. q Continue to inspect evergreen shrubs for scale (particularly Euonymus, boxwood and Burford Holly). Spray with insecticide now or with dormant oil in late winter. Heavy infestations can kill plants. q Cut back Liriope while the weather is still cold, before any chance of new shoots emerging. q After a snowfall, be sure to brush snow off of evergreen limbs to prevent breakage. q Plant spring flowering bulbs now - the is the last month to do so. q Cut back dead foliage of annuals & perennials, as well as established Bearded Iris and peonies.
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