Answer: There are two ways to separate these plants. One is to dig up the entire clump and then cut it into sections using a shovel or a knife, the other is to dig out a section and leave the main clump in place. Try to take sections from the more vigorous outer edge of the plant and discard the woodier center. A piece about six inches square will make a very nice plant next season. It is also possible to make much smaller divisions, if you want dozens of plants. Replant immediately at the same depth the plant originally grew, water well, and treat as you would any new transplant. The best time to do this are late summer and very early spring.
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