Pruning guide
How to prune dahlia
More dahlia care
- How to prune dahlia — our other guide for the same plant
- Full dahlia care guide
- Common dahlia problems & fixes
- How to propagate dahlia
- When to repot dahlia
Pruning dahlia — FAQ
When should I prune dahlia?
Pinch tips in late spring; deadhead continuously through summer and autumn; cut back after frost or in early spring. Pinch growing tips above a leaf pair when plants are 20–30 cm tall. Snip spent blooms back to a lateral bud. After frost, cut all stems to ground or near ground level.
How often does dahlia need pruning?
Continuously through bloom season; annual hard cut-back at season end. Dahlia merckii is a slender, shrubby species dahlia that benefits from light pinching early in the season to encourage branching. Deadhead spent flowers to extend the bloom period through summer into autumn. Cut to ground after frost. In frost-free areas it can persist as a small shrub; cut back by one-third in early spring to refresh.
How do you prune dahlia?
Pinch growing tips above a leaf pair when plants are 20–30 cm tall. Snip spent blooms back to a lateral bud. After frost, cut all stems to ground or near ground level.