- Written by Robbi Hoy
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Helpful tip from The Garden Geeks:
It's always best to divide spring and summer blooming perennials in the fall, and fall blooming perennials in the spring. This allows them time to put their energy into making new roots before having to spend energy on new blooms and preparing for the winter. It takes 4 to 6 weeks for a plant to become established.
You can tell when a perennial needs dividing because you will begin to see dead foliage in the center of the plant. Asters, Chrysanthemums and Astilbes need it every couple of years.
Some perennials, like Bleeding Hearts, Peonies, Baby's Breath, Dianthus and Candytuft never need to be divided unless you want to share with friends.