Knowledgebase
Old Yew, Pruning #777628
Asked November 11, 2021, 2:15 PM EST
Hennepin County Minnesota
Expert Response
Yew plants' natural shapes vary depending upon the cultivar. Some are rounded, some spreading and some upright. The following publication discusses these variables:
https://ipm.missouri.edu/MEG/2020/6/yews-DT/
Yews tolerate hard pruning so it's OK to cut them back as needed to accomplish your purpose. However, the more wood that's left, the faster the shrubs will recover. It isn't advisable to cut them to the ground.
New growth may eventually develop on branches in the shade inhibited portion.
In any case, after hard pruning it may take two or three years for the shrubs to regain their eye appeal.
Early spring is the best time to hard prune.
The following information may be of interest:
https://www.chicagotribune.com/lifestyles/home-and-garden/ct-home-0117-garden-qa-20190110-story.html