How to prune spiraea betulifolia 'tor'

After flowering in early to mid summer. Deadhead spent flower clusters by trimming lightly with shears. Each year, remove one or two of the oldest, thickest stems at ground level to encourage fresh new growth. Avoid heavy shearing, which spoils the naturally rounded habit that makes this cultivar distinctive.

Annually for light trim; renewal pruning every 2–3 years. Yes, 'Tor' birchleaf spirea benefits from some annual pruning after flowering to maintain its rounded form and good flower production. It is a well-behaved, compact shrub that needs less intervention than larger spireas. Remove spent flower heads and any dead stems; cut back the oldest stems at the base every few years to renew.

Deadhead spent flower clusters by trimming lightly with shears. Each year, remove one or two of the oldest, thickest stems at ground level to encourage fresh new growth. Avoid heavy shearing, which spoils the naturally rounded habit that makes this cultivar distinctive.