Some municipalities, regional districts, and other agencies maintain priority plant species lists to help make effective management decisions. For example, species that are particularity aggressive or pose a public health risk may be prioritized. There may also be local, environmental, economic, safety, social, political or logistical concerns that are used to prioritize species. Particular sites or areas may also be higher priority for management than others. Management actions are further determined based on these priorities and depending on available resources and treatment methods.
Due to a large number of jurisdictions, existing management programs and localized species lists in the Metro Vancouver region, the ISCMV has developed a risk ranking tool for invasive plants that can aid land managers in management decisions and species prioritization. The tool is repeatable, tailored to the region and designed to identify the risk of priority species in Metro Vancouver. It considers a number of characteristics and factors for each species. Plants are scored and the results presented as a percentage for comparison to other plants. This tool does not account for abundance of species nor does it place species into management categories.
Invasive plant species are also prioritized at a Provincial scale using a science-based risk assessment process. The following provincial resources for priortizing invasive species are available:
- Priority Invasive Species in B.C. list
- B.C. Weed Control Act & Regulation designate provincial noxious weeds, regionally noxious weeds (none in the Metro Vancouver region) and additional unregulated plants of concern.
- B.C. Invasive Plant Candidates for Eradication are candidates for the B.C. Early Detection Rapid Response (EDRR) Program. These species are either not present in B.C. or limited in population. The following EDRR candidates are found in Metro Vancouver: water lettuce (NEW), mouse ear hawkweed, North African grass, Spartina species, shiny geranium (NEW - to be confirmed), yellow floating heart, Brazilian elodea, Dyer's woad, Phragmites. The status of management of these plants under the EDRR process is available here.
- B.C. Invasive Plant Core Ranking Process is a tool that can help land managers make invasive plant management decisions. The intent of the tool is to assist land managers in the identification of invasive plants that should be actively managed, and invasive plants that should be watched. The tool can be used for large management areas OR local management areas.
Best Management Practices
Practictioners and residents can refer to regional best management practice guides (BMPs) for information on indentification and removal of invasive species. For more information, see our posted list of Best Management Practice guides.
Priority Plant Profiles
Profiles for a selection of high priority regional plant species can be found below.
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 (Cirsium arvense) is a root-creeping perennial. Thickets of thistle crowd out forage grasses in pastures and rangelands, reducing crop yields and productivity.
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
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 (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 (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 (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
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 (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 (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 (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 (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 (Polygonum spp.) are invasive perennials, with four species found in British Columbia: Japanese knotweed (Fallopia japonica); Bohemian knotweed (Fallopia x bohemica);...learn more
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 (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
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 (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 (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 (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 (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 (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 (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