I live in Iowa. When is the best time to trim a butterfly Bush??
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Bla7855538
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after it blooms
November
I prune mine in spring after they start to send out new growth, that way I can trim back to healthy branches & can also spot any dead branches.
Butterfly bushes grow back from the ground up, so late fall , I cut it all back.
When it is beginning to bud, you will be able to see any dead branches and safely remove them.
try this link -- https://ask.extension.org they answer for your specific grow zone
Hello, you can prune in late winter early spring, just not when it is growing. Hope this helps you out.