Cultivars Peonies grow best in cool climates. Some mail order catalogs provide a rating range from 100 to 300 chilling hours per winter for cultivars. Select cultivars with a low chilling requirement. In general, most of the newer peony cultivars do not perform well in the south because they were bred and selected in northern nurseries and do not receive an adequate amount of cold weather in North Carolina. Site Requirements Peonies grow best in full sun, but will tolerate light shade.
Peonies require winter cold to flower.
To encourage flowering, plant on a northern exposure and do not mulch in the winter. Flower size will decrease due to root competition from nearby trees and shrubs. The planting site should have protection from strong winds, but be well aerated to reduce diseases problems. Peonies prefer a well-drained soil with a pH of 6.0 to 7.0. Try to avoid locations where peonies have been grown before.