Paeonia x suffruticosa

Woody peonies are erect and coarsely branched, flowering, deciduous shrubs that grow up to 6.5 ft. tall. They are in the peony family (Paeoniaceae). These hybrids are ancient cultigens from China derived from the hybridization of P. jishanensis and P. rockii, but the exact parentage is lost in the mist of time. Paeonia is the classical Greek name for peony, derived from Paean, the physician to the gods of ancient Greek mythology. It may allude to the medicinal properties ascribed to the genus. The hybrid epithet means "somewhat shrubby."

Woody peonies thrive in the Piedmont, but languish in warm areas where their chilling requirement is difficult to meet and die back in very cold climates in the mountains. They do best in zones 5–8. Woody peonies do well in full sun to light shade and prefer deep, fertile soils that are well-drained. Locate them in an area that gets good air circulation. They like some afternoon shade and will require quite a bit of water in the early part of the growing season to establish their leaves and flower buds. They can take quite a while to establish and often will not produce flowers for the first year or two after transplanting. Once established, however, plants can live for decades. Peonies are outcompeted by tree roots when planted close to trees. Plants are often supplied from specialist nurseries as bare-root crowns grafted onto the roots of herbaceous peonies. Crowns should be planted or transplanted in the fall.

Tree peonies bloom in mid- to late spring, and the flowers range in size from a few inches to over nine inches in diameter. Prune this plant only to shape it; do not cut the stems to the ground in winter as with herbaceous peonies. Tree peonies often grow better in North Carolina than herbaceous peonies, but patience is required, as they can be slow to establish. Growers generally recognize three classes of woody peonies:

Lutea hybrids, derived from P. delavayi (syn. P. lutea): Flowers often have layers of color that change as the flower ages. This group often suffers from winter die-back of stems, but Lutea hybrids will recover in spring and flower on new wood.

Rockii hybrids, derived from P. rockii (syn. P. × suffruticosa subsp. rockii): Flowers often have a dark maroon spot at the bases of the petals. These plants are generally very hardy.

Suffruticosa hybrids, include P. × suffruticosa and other species. Many are hybrids developed centuries ago in China. They are strong, hardy plants with flowers in shades of white, red, and pink, but they are intolerant of winter wet.

Use tree peonies in Asian or shade gardens, or in cottage gardens. They make excellent specimens in a shrubby border. 

Insects, Diseases, and Other Plant Problems:  Ants commonly seen on peonies are harmless.  Canker, leaf blight and stem wilt occasionally afflict the plant.

Quick ID Hints:

• Deciduous shrub with twice-compound, lobed leaves
• Medium to very large, fragrant flowers on slender, brittle stems
• Stamen filaments are violet-red, and there are many concave petals.

More information on Paeonia.