Answer: Rock cress (Arabis) can be divided in spring after it blooms and can also be started from cuttings taken in the spring or early summer. Rock cress (Aubrieta) can be divided in the early fall or by cuttings taken in the spring. This plant tends to be delicate where summers are hot so you might not want to disturb a healthy plant by dividing it.
Candytuft (Iberis) is usually propagated by cuttings but can also be divided in fall or spring.
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