Fall pruning is not recommended because pruning encourages new growth which will not have enough time to harden off before cold weather arrives. Without the ability to mature, it won't survive the winter and will need to be pruned again in the spring. So, I just wait until early spring to do my pruning. When the buds begin to swell on the stems and branches, prune your hydrangeas back by as much as two thirds and your crape myrtles back 6-8inches. Best wishes with your shrubs and trees!
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