Paeonia officinalis is a PERENNIAL growing to 0.6 m (2ft) by 0.6 m (2ft in). It is hardy to zone 8. It is in flower in May, and the seeds ripen in July. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Insects. The plant is self-fertile. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and can grow in heavy clay soil. Suitable pH: acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.