Alien Species are Living in Kamloops

Release date: 
May 6, 2019

The month of May has been proclaimed “Invasive Species Action Month” by the Province of BC. Noxious weeds and invasive alien plants are non-native species that have found their way into BC, including our fine city. Without the insect predators or plant pathogens that naturally control them in their native habitats, noxious weeds and plants can quickly spread out of control and pose health, ecological, and economic impacts.

Noxious weeds and invasive plants can:
  • cause skin irritation, trigger allergies, and be unpalatable or even poisonous to animals
  • clog waterways; kill native trees; and out-compete crops, ornamentals, and native plants
  • be costly to control as they may result in a need to replant crops and restore or reclaim native ecosystems

Identified noxious weeds that are having a negative impact in Kamloops are: Japanese Knotweed, Yellow Flag Iris, Hoary Alyssum, Dalmatian Toadflax, Leafy Spurge, Sulphur Cinquefoil, Orange Hawkweed, Hoary Cress, Common Tansy, Oxeye Daisy, and Knapweed. Many invasive plants have a beautiful appearance, were initially introduced as ornamentals and some still are intentionally planted.

The City of Kamloops has developed a Noxious Weed Alert door hanger, which will be placed on the doors of residential properties where City staff have identified problem plants. If you receive one of these door hangers, please do not panic. Monitor the identified plant(s) and start management within your landscape as soon as possible. Learn the proper handling of invasive plants at
We all play a part in stopping the spread of invasive plants. Prevention is the most effective method of control. If your residential landscape is past the point of prevention, use Integrated Pest Management to deal with noxious weeds. Pesticide Use Control Bylaw No. 26-4 does NOT apply to pesticides that are used to control designated noxious and/or invasive weeds.

To learn more about invasive species, how to prevent them, as well as Integrated Pest Management, visit