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Invasive Plants

Scotch Broom

Scotch broom (Cytisus scoparius) is an escaped garden ornamental, common west of the Coast-Cascade Mountains in southwest BC, and is concentrated at the southern end of Vancouver Island. It has also been…Learn more

Scotch Thistle

Scotch thistle (Onopordum acanthium) is a biennial or perennial plant that can form dense, inpenetrable stands and competes with field crops and forage plants. Considered regionally noxious under the BC Weed…Learn more

Spotted & Diffuse Knapweed

Spotted (Centaurea biebersteinii) and diffuse knapweed (Centaurea diffusa) are biennial to short-lived perennials, and considered regionally noxious under the BC Weed Control Act. Currently distributed throughout southern BC, both spotted and diffuse knapweed are a…Learn more

Spurges (Leafy, Myrtle, Cypress)

Leafy spurge (Euphorbia esula) is a perennial, considered noxious under the BC Weed Control Act, and commonly found at low- to mid-elevations on dry roadsides, fields, grasslands, open forests, and disturbed habitats. Isolated…Learn more

St. John’s Wort

St. John's-wort (Hypericum perforatum) is a perennial invader of grazed and disturbed lands that creates dense stands, displacing native plant species and reducing available forage for livestock and wildlfie. Plants contain…Learn more

Sulphur Cinquefoil

Sulphur cinquefoil (Potentilla recta) is a perennial and considered regionally noxious under the BC Weed Control Act. It is commonly found on grasslands, shrubby areas, dry open forests, and disturbed sites such as…Learn more

Tamarisk

Tamarisk (Tamarix chinensis), also known as salt cedar, is a shrub-like tree which has become invasive to riparian areas. This is aggressive woody shrub is known to produce dense stands…Learn more

Tansy Ragwort

Tansy ragwort (Senecio jacobaea) is a biennial to short-lived perennial. Considered noxious under the BC Weed Control Act, tansy ragwort grows in grazed pastures, hay fields, vacant non-crop lands, roadsides, clear cuts,…Learn more

Teasel - “Alert” Species

Teasel (Dipsacus fullonum) is a biennial or sometimes a perennial weed that prefers open, sunny areas, and will tolerate a range of wet to dry conditions. It is found in pastures, meadows, disturbed areas…Learn more

Wild Caraway

Wild caraway (Carum carvi) is a biennial plant that invades pastures, rangeland and natural areas and is identified by white groups of flowers at the top of several erect, branched stems that…Learn more

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