Marsh plume thistle (Cirsium palustre) is a biennial or perennial herb characterized by its tall, spiny-winged stems, deeply lobed, spiny leaves, and clusters of purple flowers at the tips of the stems. It is considered an invasive species in BC.
Greater knapweed is a perennial herb with distinctive purple, thistle-like flower heads. It can grow up to 30 inches tall and thrives in full sun, well-drained soils.
Dame’s rocket (Hesperis matronalis) is a weed commonly found in BC, easily identifiable by its fragrant, showy flowers with four petals, often purple but can be pink or white.
It spreads rapidly via stems that root where they touch the ground and forms dense mats, inhibiting the growth of native plants.
Field scabious crowds out forage and pasture plants, reducing food availability for grazing animals. It grows along disturbed roadsides throughout the province. It is an escaped ornamental popular for its pretty flower and ability to attract butterflies from its native range of Europe and Asia.