When should we divide our irises? I have several huge clumps that don’t bloom as well as they used to.
A: Irises (Tall-bearded, dwarf-bearded, I. pallida, and other traditional garden types) are amazingly tough and resilient. I have divided and moved them almost any time of the year. Ideally, though, late summer is the best time. Dividing in late July or August allows the semi-dormant plants to become well-established and to reserve plenty of carbohydrates. Iris divided in late summer are…
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