How to prune belladonna larkspur

Throughout summer after each bloom flush; final cutback in late summer or autumn. Deadhead by cutting spent spikes back to a side-shoot or leaf node. At season's end, cut all growth to ground level. Clean up any diseased foliage promptly as delphiniums are susceptible to powdery mildew.

Deadhead repeatedly through summer; cut to ground once annually in autumn. Belladonna larkspur is a hybrid that repeat-blooms if deadheaded consistently. Cut spent flower spikes back to lateral shoots or the base of the stem to encourage a second and even third flush of blooms. After all flowering is finished in late summer, cut all stems to ground level. Staking is usually needed before pruning becomes relevant.

Deadhead by cutting spent spikes back to a side-shoot or leaf node. At season's end, cut all growth to ground level. Clean up any diseased foliage promptly as delphiniums are susceptible to powdery mildew.