While most pruning is done in December, you can still prune now but it may affect the number of berries produced this year. Hollies, as with most shrubs, can be pruned back by a third of their growth. Any more than that will likely harm the plants. This article should help: https://www.gardeningknowhow.com/ornamental/shrubs/holly/trimming-holly-bushes-how-to-prune-holly-bushes.htm
Answered on June 27, 2015
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