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Join Dr. Daniel Simberloff & Dr. Anthony Ricciardi in Kamloops. learn more »

Parrot's Feather

A popular aquatic garden plant that spreads with water currents, animals, boats/trailers and fishing gear. Dense stands can stagnate water, and increase breeding grounds for mosquitoes learn more »

Zebra/Quagga Mussels

These tiny freshwater mussels clog drains, damage infrastructure, and are very costly to control/eradicate learn more »

Giant Hogweed

A towering toxic invasive plant with WorkSafe BC regulations learn more »

Invasive Species Research Conference

Turning Science into Action! Co-hosted by Thompson Rivers University and the Invasive Species Council of BC. learn more »

European Fire Ant

A tiny ant with a toxic sting learn more »

Purple Loosestrife

An aggressive wetland invader that threatens plant and animal diversity learn more »

Orange Hawkweed

Also yellow, these invasive plants replace native vegetation along roadsides, and threaten areas not yet reforested learn more »

Japanese Knotweed

Grows aggressively through concrete, impacting roads and house foundations learn more »

Spotted Knapweed

A single plant spreads rapidly with up to 140,000 seeds per square metre learn more »

Scotch Broom

An evergreen shrub that invades rangelands, replaces forage plants, causes allergies in people, and is a serious competitor to conifer seedlings learn more »

Yellow Toadflax

Species
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. 

Gallery: Yellow Toadflax