How to Prune stag's horn sumach?
For colourful stems or large foliage, prune hard to a low framework. Let young plants establish for one to two years first. Prune in late winter or spring, before or as new growth starts.

stag's horn sumach · Rhus typhina
Also known as: green-flowered sumach; staghorn sumac; velvet sumac; vinegar tree; Virginian sumach
Grow in moist but well-drained soil in full sun to obtain best autumn colour. Suckering in habit and has the potential to become a nuisance
For colourful stems or large foliage, prune hard to a low framework. Let young plants establish for one to two years first. Prune in late winter or spring, before or as new growth starts.