Butterfly bush (Buddleia) with bare lower stems: most varieties bloom on new wood. Hard prune to 18-24" in early spring. Trellis-trained types can stay longer.
Consult pruning book (buy at nursery). Local garden center identifies variety and demonstrates technique. Annual hard pruning maintains dense, floriferous habit.
If completely dead at base: may be root issue. Check drainage. Replace if no regrowth after pruning.
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