If your peony just doesn't bloom like it used to, it may be time to divide and replant it. Dividing a peony can improve the overall health of the plant, and it gives gardeners an inexpensive way to add more of the flowering plant without heading to the garden center. In a few easy steps, you can divide a peony and transplant it to a new spot in your garden or share it to go in someone else's.
Prepare the peony for division by first cutting away any foliage with a pair of garden shears. Use a hand shovel to dig around the outer edge of the plant clump. Remove as much of the root system as possible. Lift the clump and roots from the hole. Use the garden shears to divide the clump into three to five sections.
Find a sunny, well-drained area to place the clump divisions. Use a hand shovel to dig a hole. Dig the hole to the depth of the previous hole, about 18 inches. Replace the soil if peonies have previously grown in the spot. Amend the soil with a layer of compost, about three inches thick.
Set the plant no more than two inches below soil level. Cover the plant with the remaining soil. Water the peony well. Place a 2-to-3-inch layer of shredded bark mulch around the peonies. Do not allow the mulch to come in contact with the stems.
Create a temporary home for the peony in a shady area of the garden if it cannot be replanted. Divide and replant peonies in the fall, when they are dormant, for best results.