Oregon State University has not published any documents on how to prune a Cotinus specifically but I found this guide that shows you the two ways to prune your smoke tree (shrub).

Find out how to prune fruit trees properly, plus tips for timing your pruning right.

Do yourself and your shrubs some good by getting outside to prune them in midwinter. “This time of year, when shrubs and small trees are dormant, is an easy time to prune them,” said Sharon ...

Pruning is both a science and an art. It may seem challenging, but there are plenty of resources to help you do a good job. Here are some highlights to get you started. Trees and shrubs benefit ...

Why you should plan to prune in February and early March Late winter to early spring when trees are still dormant (before leaves appear) is the best time to prune most trees, including fruit trees.

Question: Some of my trees need to be pruned. Can I do some of the pruning myself or should I just hire an arborist?

Find out how to prune fruit trees properly, plus tips for timing your pruning right.