Pruning guide
How to prune new york aster
More new york aster care
Pruning new york aster — FAQ
When should I prune new york aster?
Late spring (Chelsea chop); late autumn to early spring (full cutback). Pinch or shear stems by half in late May. After flowering and frost, cut all stems to near ground level. When dividing, discard the exhausted central section and replant fresh outer growth with plenty of root.
How often does new york aster need pruning?
Annual cutback; Chelsea chop annually; divide every 2–3 years. New York aster grows vigorously and spreads quickly. Cut back to ground level each winter after frost kills the top growth. A Chelsea chop — cutting stems by half in late May or early June — produces a denser, more floriferous plant that needs less staking. Divide every 2–3 years to prevent die-out in the centre.
How do you prune new york aster?
Pinch or shear stems by half in late May. After flowering and frost, cut all stems to near ground level. When dividing, discard the exhausted central section and replant fresh outer growth with plenty of root.