Doug Kanter wrote:

Taken over? I just bought a house with a gorgeous butterfly bush out front.
Sometimes I like plants that spread/take over, but not sure about this one
yet. Do they tend to get invasive if not disciplined?

We live in an area with hard frosts (zone 6) and butterfly bushes
frequently die to the ground but come back each year except this year.
This year many didn't come back. We had an unusually long winter, not
especially cold, but very long. We have not had a problem with the
plants spreading. We have to take cuttings to propagate them.

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