Most peonies have very attractive foliage that makes them a useful addition to the landscape all season. Herbaceous peonies need at least six hours of full sun a day for good bloom. Afternoon shade will protect flowers from fading too quickly in hot areas. Tree peonies should always have dappled or afternoon shade since the large, silky petals are damaged by excess sun. Well-drained, loamy soil is best for good growth of peonies.
Good drainage is vital to avoid root rot and fungal diseases.
If your soil is heavy clay, amend it with compost, finely ground pine bark or well-rotted manure to improve drainage and organic matter content. Peonies prefer a pH of 6.5 to 7.0. You may need to add lime to your soil to raise the pH for best growth of peonies. Peonies are long-lived in the garden and are worth extra trouble at the time of planting, since they may stay in the same spot for many years. Fall planting is best.