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Similarly, it is asked, how do you save a dying butterfly bush?
Try gently twisting a stem around your finger – if it snaps off, it's probably dead, but if it bends, it's probably alive. If it's late in the spring and you discover dead growth on your butterfly bush, prune it away. New growth can only come from living stems, and this should encourage it to start growing.
In this manner, do butterfly bushes die?
Butterfly bushes are perennial plants that die back to the ground every winter. They then send out new growth from the roots in the spring. You can prune them either in the late fall or in the early spring before the new growth starts.
The life span of B. davidii is variable although in general individuals do not live for more than 20 years, often dying from stem rot (Smale, 1990; Binggeli et al., 1998).