How to prune anise hyssop

Deadhead throughout summer; cut back hard in late autumn. Pinch or snip spent flower spikes back to the next set of leaves to encourage branching and reblooming. In autumn, cut stems down to 3–4 inches above soil level to tidy the plant and promote healthy regrowth next spring.

Deadhead weekly during bloom; hard cut once annually in autumn. Anise hyssop benefits from regular pruning to extend its flowering season and prevent self-seeding. Deadhead spent flower spikes throughout summer to encourage new blooms. Cut the whole plant back by about half in midsummer if it becomes leggy. Trim to a few inches above the ground in late autumn after the first frost.

Pinch or snip spent flower spikes back to the next set of leaves to encourage branching and reblooming. In autumn, cut stems down to 3–4 inches above soil level to tidy the plant and promote healthy regrowth next spring.