How to prune delphinium 'galahad'

After first flush (early–midsummer); full cut-back in autumn. Remove spent flower spikes to the nearest lateral bud or to the base. After all secondary blooms are spent, cut all stems to soil level. Remove autumn debris to reduce slug habitat.

Deadhead after each flush; full cut-back once annually in autumn. Cutting spent spikes back to lateral buds or strong basal shoots after the first flush encourages a valuable second round of the pure-white blooms in late summer. Once secondary spikes finish, cut to ground. Clear all top growth to ground level in autumn after frost to keep crowns healthy for the next season.

Remove spent flower spikes to the nearest lateral bud or to the base. After all secondary blooms are spent, cut all stems to soil level. Remove autumn debris to reduce slug habitat.