- Plants usually bloom better if you divide clumps every 3 to 4 years.
- Lift the entire clump using a garden fork in early spring through mid-fall. The best time is after they have finished flowering. Start by placing the fork in the ground 6 to 12 inches away from the base of the plant. Gently push down on the handle to pry the clump up and out of the soil. Work around the root ball repeating this process until the roots are freed.
- Cut the foliage back to a few inches. Next pull or cut the thick tangle of roots apart. Make sure you keep a portion of the crown in each division.
- If you want to fill a large spot quickly, plant a group of smaller divisions in one planting hole. Make 3 mounds of soil in a large hole to accommodate 3 divisions and fan the roots of each division over a mound.
- Replant keeping the crown just below the surface. Back-fill with soil and tamp it gently around the roots. Mulch with a 2-3” layer to discourage weeds, protect the roots from drying out and to help control temperature extremes. Water thoroughly.
