- Linaria vulgaris, L. genistifolia subsp. dalmatica
Yellow Toadflax (Linaria vulgaris), also known as common toadflax, is an herbaceous perennial known for its colony forming properties. This invasive species uses creeping roots to rapidly take over road sides, pastures, and grasslands.
Listed as provincially noxious under the BC Weed Control Act, yellow toadflax is present throughout most of BC; abundant in the Okanagan, Similkameen, Thompson, Boundary, East Kootenay, and Cariboo regions.
With vibrant yellow flowers, similar to that of a snapdragon, yellow toadflax is able to stand out when it has established. These yellow flowers are generally 2-3.5cm in length and have a small orange spot on the lower lip; the plant itself ranges from 10-80cm in height once mature.
Assumed to have been introduced as an ornamental plant, yellow toadflax now spreads using creeping roots and seed dispersal. The seeds of this species are still commonly found in ‘wildflower’ seed mix; please avoid using these seed mixes to prevent further spread.