Plant experts at The Morton Arboretum advise to wait until your trees and shrubs are dormant.
There’s plenty to do in the garden in early autumn: planting bulbs, dividing perennials, preparing vegetable beds for next season and watering. But there’s one thing you should not do for several more weeks until the leaves have fallen: prune trees and shrubs.
Early fall pruning also risks spreading disease and insect pests. During warm weather, the tissues of a shrub or tree are active and growing, and so are the bacteria, viruses and fungi that cause plant diseases. Pathogens or insects can easily enter pruning wounds. When will it be safe to prune? Once shrubs are fully dormant. “There’s no firm date,” she said. Dormancy can come earlier or later from one year to the next. Warm weather in autumn will slow down the process.
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