Prunella vulgaris is an edible, semi-evergreen perennial species in the mint family, Lamiaceae. It is known by a range of common names including Self-Heal, Blue Curls and Heart of the Earth. It typically grows to around 30m in height, producing oblong to oval-shaped foliage on creeping stems. Flowers are borne on unbranched, indeterminate inflorescences termed spikes, these are similar to a raceme, but with sessile flowers, these are attached directly to the spike without stalks. Flowers are typically purple, however white and pink blooms have been observed, the flowers are tubular and appear from summer to early autumn. It has a mat-forming habit and is hardy to -15 degrees Celsius, plant in a position of full or partial sun, in very moist soil for optimal growth.