Groups of five petaled flowers at the end of branches
Seed
More than 30,000 seeds per plant
May remain viable for up to 30 years
Reproduction
Seed, rhizomes, vegetatively
Control
Biological
Leaf feeding beetle (Chrysolina spp.)
Chemical
Cultural
Prevention
Fertilization to promote grass cover
Revegetation of highly disturbed sites
Removal - not effective unless done first year plants germinate; otherwise this will fragment the roots and give rise to many more plants. All plant parts should be bagged and disposed of
Mechanical
Burning N/A Not recommended, fire encourages growth
Grazing N/A Not recommended. St Johnswort contains hypericin which is harmful to animals