- Yellow archangel is a trailing plant that grows along the ground
- It’s stems and stolons are square as it is a member of the mint family
- Leaves are hairy, oval to heart shaped, and toothed with silver-grey markings
- Flowers are small helmet shaped and yellow with markings in orange or brown
Consequences of invasion
- Yellow archangel can create dense ground cover in forests, riparian areas, and transitional ecosystems causing a reduction in plant species diversity
- It does not offer a source of food for wildlife, it actually reduces food availability for native wildlife.
- The reduction in plant species diversity means a lack of flowers for pollinators in the spring months. This means insect communities have to
spend vital energy resources searching farther for booms in the summer and early fall.
- Agricultural: Can displace shade tolerant crops and reduce yields.
How was it introduced? How does it Spread?
- Sold to gardeners as a hardy, low maintenance groundcover species, this invasive can escape by stolons crawling under and over fences into woodland margins, parks, ditches, ravines and other natural spaces.
- Stem fragments can form an entirely new plant and when found in compost or improperly disposed of garden waste it can create new populations away from the parent plant.
- Seeds are a secondary form of dispersal. They are dispersed by animals and humans passing through the vegetation,
while ants have been reported to transport seeds up to 70 metres from the parent plant.
Integrated Pest Management Options
- Prevention is key, do not plant yellow archangel or buy basket arrangements that include it. Click here for more tips on how to keep your garden invasive free.
- Existing patches can be controlled by regular trimming or digging
- This plant spreads easily through stem cuttings, so be sure to bag plant parts and dispose of them in the garbage
- Hand pulling is effective, however, because the plants grow in such dense clusters it can be labor intensive
- Sheet mulching can be effective but be weary of escaping plants or any holes in the sheet material
- Chemical treatments may be used depending on the surrounding habitat