When to prune or deadhead butterfly bushes.
Do we need to take faded flowers off of butterfly bushes?
Certified GKH Gardening Expert
It is a chore to deadhead butterfly bushes, but doing so will enhance the look of the shrub and prevent seeds from forming and dropping, producing weedy volunteers that invade native wetlands. Most bushes are hybrids and the seeds don't come back true. Ask for the sterile variety when purchasing butterfly bush.
Here is more information: