As of December 31, 2009, butterfly bush are only allowed to be sold by a few licensed nurseries in Oregon. Existing plants, both at nurseries and in home gardens, must be dead-headed so they can't go to seed.
The Oregon Department of Agriculture has classified the butterfly bush as a Level B noxious weed because:
ODA Plant Division. Noxious Weed Control
The Oregon Department of Agriculture has classified the butterfly bush as a Level B noxious weed because:
"This plant is a pioneering species that dominates open habitats. It poses an ecological threat to dry-land meadows, open slopes and dunes, dominating these sites as much as Scotch broom has historically. It also invades reforested sites, resulting in a loss of forest productivity."Today I dead-headed the one butterfly bush I have on my sidewalk strip, placing the seed heads into my worm bin where they will be obliterated by hungry red wigglers.
ODA Plant Division. Noxious Weed Control
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