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When to divide astilbes #917459

Asked September 14, 2025, 11:03 AM EDT

When should I divide astilbe plants? Mine are several years old and need to be divided.

Hennepin County Minnesota

Expert Response

Autumn is a good time to divide spring and summer blooming perennials, including astilbes. I would wait until our temps go down a bit - even later this week. The heat is hard on them so try for a cloudy or overcast day, hopefully just before a good rain is expected.

https://extension.umn.edu/planting-and-growing-guides/dividing-perennials

Deb Reierson Replied September 14, 2025, 3:23 PM EDT

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