If planted in the spring, they may not bloom for a year or two. Be sure the divisions are free from rot when they are planted. Trim away any soft spots with a sharp knife. Dig a hole 12 to 18 inches deep and 18 inches wide, spacing holes 3 to 4 feet apart. Avoid adding fertilizer to soil that will surround the roots.
Many gardeners add a half cup of bone meal or superphosphate at planting.
Fill the hole about half full of amended soil then place the root division with the eyes facing upward. After the division is in place, work the soil in around the fleshy roots. If planted in September, the clumps should be partially established before severe cold weather occurs. Plant a tree peony tuber with 4 to 5 inches of soil covering the graft. The graft can be recognized by the ridge on the stem and a difference in bark texture.