last year I bought a butterfly bush that grew to about 3 feet tall.Do I have to trim it back in the spring?If so,how much should I cut it back?

Wait until you see new growth and cut it back to just above where the new shoots are forming.  Depending on the variety and the severity of the winter, it may die back right to the ground or only partway.  I like to wait and see and then prune.

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