When is the best time to transplant and divide perennials?
The best time to divide perennials depends on your climate. Here in Montana, it’s usually mid to late April and early fall, from late August through September. In colder climates, spring division is preferred because it allows plants plenty of time to settle in before winter. In hot-summer climates, fall is the best time to divide; plants divided in spring may not become established before the arrival of the heat. A few plants insist on their own timetable. Peonies and Bearded Iris, for example, prefer to be divided in late summer or fall. They won’t bloom again until the following year if divided in spring.
