Viola sororia is a PERENNIAL growing to 0.1 m (0ft 4in).It is hardy to zone (UK) 4. It is in flower from March to June. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects.Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: acid and neutral soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.