- Yellow, 5 petalled flowers
- Leaves are opposite, hairy, 1-3 inches long and divided into leaflets
- Stems are greenish-red, branches spread from the center of the plant, and can spread up to 2m
- Seed heads are sharp – they can injure bare feet and pets paws or puncture bike tires!
Introduction and spread
- Spiny seeds can easily embed themselves into bike tires, clothing or pets fur and travel to new areas.
Consequences of invasion
- Poses a serious threat to agriculture and recreation
- Quickly develops a deep taproot and aggressively competes for water and nutrients needed by trees, field crops and native plants
- Can make hay become unusable as sharp spines of seed can injure mouth and digestive track of animals
- Can be toxic to sheep and cattle, causing nitrate poisoning, blindness and death
- Can ruin outdoor equipment and the paws of pets
Integrated Pest Management Options
- Can be easily removed by hand if detected early. Ensure removal of entire taproot and dispose at local landfill. Do not drop any seeds onto the ground
- Once seed bank has established, monitor and remove plants as they emerge and continue to do so for several years
- Shallow tilling of seedlings or small plants can be effective in larger areas
- Make sure to thoroughly check clothing, pets, vehicles and equipment for seeds
- Report this weed if you see it!