RHS 
Annual Biennial
A self-seeding biennial growing to around 60cm. The heart-shaped leaves have an irregular, white border, the white flowers appear in late spring and early summer, and are followed by flat, circular seedpods. When ripe, the outer covers and seeds fall away, revealing silvery, paper-thin discs
Position
Full sun, Partial shade
Soil Types
Chalk, Loam, Sand
Max Height
0.5-1 metres
Max Spread
0.1-0.5 metres