Kamloops and the Thompson-Nicola region are home to distinctive ecosystems shaped by a dry climate, rolling grasslands, and riparian corridors. These landscapes support diverse native plants and wildlife but are increasingly threatened by invasive plants — non-native species that spread aggressively and disrupt ecological balance.
Why Invasive Plants Are a Problem
Without the natural checks and balances of their home ecosystems, invasive plants can reproduce rapidly, spreading by seed, roots, or even small fragments. Once established, they crowd out native species, reduce food and habitat for wildlife, and alter soil chemistry or fire regimes. This loss of biodiversity makes ecosystems less resilient, particularly in a region already facing drought and climate stress.
Key Invasive Plants in Kamloops
Leafy Spurge (Euphorbia esula)
A deep-rooted perennial that spreads by both seed and underground shoots. Its latex sap deters grazing animals, leaving infested pastures unproductive and displacing native grasses and wildflowers.
Baby’s Breath (Gypsophila paniculata)
Introduced as an ornamental, this plant thrives in sandy soils and produces abundant seeds. With its long taproot and dense growth, it can crowd out native wildflowers and grasses in grassland habitats.
Spotted Knapweed (Centaurea stoebe)
One of the region’s most widespread invaders. It produces chemicals that suppress surrounding plants, giving it a competitive edge in grasslands and open areas. Dense stands reduce forage for wildlife and livestock.
Russian Olive (Elaeagnus angustifolia)
Planted for landscaping and shelterbelts, this tree now spreads along rivers and wetlands. It replaces native willows and cottonwoods, shading out diverse understory plants that support birds, pollinators, and amphibians.
Siberian Elm (Ulmus pumila)
A fast-growing tree that forms dense stands in riparian zones and urban areas. Its prolific seed production enables rapid spread, and infestations are often accompanied by elm seed bugs, creating a nuisance for homeowners.
Management and Prevention
Invasive plant control requires persistence and multiple strategies:
Prevention: Avoid planting invasive species and instead select drought-tolerant native alternatives. Clean footwear, vehicles, and tools to reduce the chance of spreading seeds.
Early Detection: Report sightings promptly to:
bcinvasives.ca/take-action/report/ OR 1-888-933-3722
www.reportaweedbc.ca/ to download the app
www2.gov.bc.ca/gov/content/environment/plants-animals-ecosystems/invasive-species/reporting-invasive-species OR [email protected]
Physical Removal: Hand-pulling, digging, or mowing may work for small infestations. Woody species like Russian olive and Siberian elm need root removal to prevent regrowth. Dispose of all plant material properly, never composted or dumped in natural areas.
Restoration: Replant cleared areas with native or drought-tolerant species to stabilize soil, reduce erosion, and discourage reinvasion.
A Shared Responsibility
Every invasive plant removed or prevented makes a difference. By planting native species, reporting infestations, and helping to stop the spread, Kamloops residents can play an active role in protecting our landscapes. With collective effort, we can preserve the ecological health and natural beauty of the Kamloops and Thompson-Nicola region for generations to come.
For more information, visit:
Invasive Species Council of BC: bcinvasives.ca
Grow Me Instead: bcinvasives.ca/play-your-part/plantwise/grow-me-instead/
Thompson-Nicola Regional District Invasive Plant Management: www.tnrd.ca/services/invasive-plant-management/regional-invasive-plants
Corrine Giesbrecht is an avid gardener who would like to confess she also has an invasive plant problem. Between trying to prevent the Siberian elms from maturing to the fragrant creeping Charlie in her lawn. Problem solving persists and is never-ending, but this is part of why we love plants.