Blue periwinkle’s broad-leaved runners form a dense mat, shading out native plants and competing for moisture and nutrients. Its growth is particularly vigorous in riparian and other moist habitats. Blue periwinkle expands by means of creeping stems that take root at the nodes and tips. New infestations can establish from plant fragments when broken off and transported by dumping of garden waste, soil movement or floods.
Control
- Hand removal and disposal of vegetative material
- Herbicide treatment