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A. You can prune healthy yews (Taxus spp.) back quite severely with no problem. You can easily reduce their size by one-half to three-quarters. Such severe pruning is best done in early spring so they have spring and summer to recover. They will respond by throwing up a lot of new shrubhauling.barted Reading Time: 3 mins.

May 26, Pruning Yews Selectively Download Article 1. Start pruning yews in late March or early April.

Cut out diseased, dead, or broken branches.

This is right before new growth will start to take place. 2. Cut out diseased, dead, or broken 95%(43). Dec 21, Japanese Yew Pruning Maintenance – Tips For Trimming A Japanese Yew Pruning a Japanese Yew Tree. Japanese yew cultivars range in size significantly. They can be quite tall or very short. Annual Japanese Yew Pruning. When it’s time for cutting back Japanese yews, pick up the pruners in spring before Estimated Reading Time: 2 mins.