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They did take a hit for sure this year but the new growth has been vigorous so far. Just cut off the dead stems, although first thing in spring would have been better. You can just cut down stem till you hit green most every spring. I too cut back my butterfly bush too. I always do when they get too big for their spot or leggy. You need to prune stuff it is good for the plant. If you want good flowers on woody plants you can dead head the flowers after they bloom. I pretty much have every flowering shrub you can have and that would take many hours so I don't bother to do it that much but it would be advantageous to do so if you only have a few flowering shrubs.
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