Answer: Mulch butterfly bushes (Buddleia davidii) in the fall, then prune the plants back to the ground in late winter. This perennial will re-emerge from its roots in spring. Blooms tend to be larger and more prolific on butterfly bush's new growth, giving you incentive for pruning it. You essentially want to treat butterfly bush plant as if it were an herbaceous perennial rather than a shrub. Best wishes with your butterfly bush.
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