Pruning guide
How to prune agastache 'black adder'
More agastache 'black adder' care
Pruning agastache 'black adder' — FAQ
When should I prune agastache 'black adder'?
Early spring for main cut-back; throughout summer after each bloom flush. Cut spent flower spikes by one-half during the season to encourage re-bloom. In early spring, shear all stems back to 4–6 inches above the crown once new growth buds are visible at the base.
How often does agastache 'black adder' need pruning?
Once in early spring; shear spent spikes every few weeks through summer and autumn. Agastache 'Black Adder' is a vigorous, long-blooming cultivar that responds well to regular trimming. Shear spent flower spikes back by one-half after each flush to encourage repeat blooming into autumn. In early spring, cut all stems back to 4–6 inches above the crown, just above emerging green buds. Do not cut into completely woody, leafless stems.
How do you prune agastache 'black adder'?
Cut spent flower spikes by one-half during the season to encourage re-bloom. In early spring, shear all stems back to 4–6 inches above the crown once new growth buds are visible at the base.