Answer: If you dig and divide your asters now while they are blooming, they will stop blooming. Instead, I'd wait until spring to dig and divide them. Your sister can plant them in her garden and by summer they will be well established and will flower for you both. You can divide spring or early summer blooming perennials in late summer after they have finished flowering and fall flowering perennials such as asters and mums in the spring. Enjoy your garden!
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