Answer: Sorry to say, the butterfly bush isn't really hardy enough for your conditions. It is generally recommended for zones 5-9. You could give it a try in a well protected area, away from prevailing winter winds and with lots of attention to winter protection, but be prepared for partial or complete die-back. Have you considered alternatives? There are several lilac varieties such as the Nodding lilac (Syringa reflexa) that are hardy in your zone. Check with your extension agent or local nurseries forother ideas.
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