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Priority Plants

Since time and funding are limited for all jurisdictions dealing with invasive species, the ISCMV provides a priority invasive plant list which can be helpful in making smart management decisions. Species that are particularity aggressive, not yet widespread, or pose a public health risk are considered high priority species.

Click here to access an old regional priority plant list. Please note that this list is currently undergoing rigorous review by the ISCMV Technical Committee with the support of a professional biologist; the updated list will be available in in 2019.

Best Management Practice guides are available here for knotweeds, Scotch broom, Himilayan blackberry and giant hogweed.

Profiles for a selection of high priority regional plant species can be found below.

Butterfly Bush

Butterfly bush (Buddleja davidii) is a deciduous to semi evergreen shrub that grows up to 5 m tall. Until only recently, this species was celebrated for its robust...learn more

Canada Thistle

Canada thistle (Cirsium arvense) is a root-creeping perennial. Thickets of thistle crowd out forage grasses in pastures and rangelands, reducing crop yields and productivity.  ...learn more

Common Periwinkle

Common periwinkle (Vinca minor) is a small evergreen plant with showy white or purple flowers. This invasive plant is capable of forming dense mats which supress native plant...learn more

Daphne

Although it has a poisonous sap, Daphne or Spurge-Laurel (Daphne laureola), is a top ornamental pick for gardens. This species can be purchased at a number of garden...learn more

English Holly

English holly (Ilex aquifolium) is grown for its bright red berries and spiny, dark green evergreen foliage. A large shrub or small tree, English holly has...learn more

English Ivy

English ivy (Hedera helix) is an evergreen vine that is recognized as a serious, smothering invasive in much of southwestern BC. It is commonly planted to...learn more

Eurasian Watermilfoil

Eurasian watermilfoil (Myriophyllum spicatum) is a perennial aquatic invasive plant that established in the early 1970s in the Okanagan and has spread to select waterbodies in the...learn more

Garlic Mustard

It is a herbaceous biennial plant growing from a deeply growing, thin, white taproot that is scented like horseradish. In the first year, plants appear as...learn more

Giant hogweed

Giant hogweed (Heracleum mantegazzianum) is a perennial and currently distributed in the Lower Mainland, Fraser Valley, Gulf Islands, and central to southern Vancouver Island. Giant hogweed has...learn more

Gorse

Gorse (Ulex europaeus) is a spiny, perennial evergreen shrub, considered noxious under the BC Weed Control Act, and thrives on sunny clearings with...learn more

Himalayan Balsam

Himalayan balsam (Impatiens glandulifera) is an exotic-looking annual that has pink, helmet-shaped flowers (also known as "policeman’s helmet”), rapid growth, and an entertaining mode of...learn more

Himalayan Blackberry

Himalayan blackberry (Rubus armeniacus) is mostly a biennial plant, growing on disturbed sites, along roadsides and rights-of-ways, in pastures, along river and stream banks, fresh-water wetlands,...learn more

Knotweeds

Knotweeds (Polygonum spp.) are invasive perennials, with four species found in British Columbia: Japanese knotweed (Fallopia japonica); Bohemian knotweed (Fallopia x bohemica);...learn more

Orange Hawkweed

Hawkweeds (Hieracium spp.) are perennial plants with 14 non-native species recorded in BC, and are difficult to identify among the 8 native hawkweed species. One of the 14 non-native...learn more

Parrot’s Feather

Parrot’s feather (Myriophyllum aquaticum) is an aquatic perennial that is currently impacted several areas within BC. This species is known to out-compete and replace native aquatic...learn more

Policeman’s Helmet

The common names Policeman's Helmet, Bobby Tops, Copper Tops, and Gnome's Hatstand all originate from the flowers being decidedly hat-shaped. Himalayan Balsam...learn more

Purple Loosestrife

Purple loosestrife (Lythrum salicaria) is a woody half-shrub, wetland perennial that has the ability to out-compete most native species in BC’s wetland ecosystems....learn more

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...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,...learn more

Wild Chervil

Wild chervil (Anthriscus sylvestris (L.) Hoffm.) is an annual, biennial or short-lived perennial forb that produces small white flowers in umbrella-like clusters along 2 cm long stalks at the...learn more

Yellow Archangel

Yellow Archangel (Lamiastrum galeobdolon) is considered a shade tolerant species which is commonly found in hanging baskets and as ground cover. With many methods of reproduction, yellow rchangel...learn more

Yellow Flag Iris

Yellow flag-iris (Iris pseudacorus) is an eye-catching perennial that creates dense stands in wet areas, excluding native wetland species and threatening plant and animal diversity. Yellow...learn more