How to prune new england aster 'purple dome'

Pinch in late spring (May–June); cut back after flowering or in early spring. Pinch or shear shoot tips by about one-third in late May to early June to promote bushiness. After flowering, cut stems back to ground level with secateurs or shears.

Pinch once in late spring; full cut-back once annually. Pruning is important for this aster. Pinching stems back by one-third in late spring to early summer keeps the compact mound tidy and delays flowering slightly to avoid floppy stems. Deadhead spent blooms to extend the season. Cut the whole plant back hard to the ground after flowering or in early spring.

Pinch or shear shoot tips by about one-third in late May to early June to promote bushiness. After flowering, cut stems back to ground level with secateurs or shears.