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Step 4. Prune the dappled willow in early winter or early spring when it lies dormant. Cut out any dead, diseased, infested or broken branches with pruning shears. For a short, dense plant, prune all branches down to 12 inches tall every few years.
The best time of year to prune oak trees is from late fall until the end of March, when oak wilt disease is dormant and there is no risk of infection. If your oak tree is pruned at any other time of the year, some type of sealant should be applied to all pruning wounds to prevent oak wilt infection. Pruning paint is effective along with any latex paint. This same time period is also appropriate for trimming other species of trees, when insects and disease are dormant.