- Solitary yellow flower at the end of a stem about 1 metre tall.
- Sharp spines extend out from below the flower head.
- Stem is erect and blue-green coloured with fuzzy hairs. Grows in bunches and appears bush-like.
Consequences of invasion
- Infests rangeland and is fatally toxic to horses. The toxin damages nerve centers in the brains of horses, which control eating and drinking habits.
- Outcompetes native plants and grasses resulting in decreased biodiversity
How is it introduced? How does it spread?
- This plant is classified as “Prevent” on the provincial Priority Invasive Species in B.C. list, meaning that it is either new or not yet present in BC.
- Often spread on equipment and vehicles, especially with the transportation of livestock.
- Seeds have been found in wildflower seed mixes and grass seed.
- It is important to check what seeds are in wildflower seed mixes before they are planted to avoid unintentional planting.
- Become PlantWise and learn about Grow Me Instead.
- Livestock that has been in pasture with these plants must not be transported to areas not yet infested.
- Check all clothing and brush off your boots when leaving an infested area.
- Small infestations can be controlled by hand pulling before plants flower.
- Mowing when the plant is beginning to flower is another option.
- Infestations must be treated as early as possible to be the most effective.