Invasive Plants


Invasive plants (synonyms: alien, exotic, non-native, non-indigenous) are species that have been introduced, either intentionally (e.g. through horticulture) or accidentally, to an area where they do not naturally occur. Once there, invasive plants aggressively grow and proliferate. Not all non-native plants are invasive, but in almost all cases invasive plants are non-native.

What's the Problem?

Invasive plants negatively impact biodiversity, watercourses and natural areas, as well as the safety and use of local parks. Specifically, invasive plants:

  • Compete with and displace native plants
  • Establish monocultures
  • Hybridize with native plants
  • Degrade habitat quality
  • Reduce recreational opportunities
  • Can cause economic loss
  • Can damage property

Find out what invasive plants are in Metro Vancouver.

What is Delta Doing?

Invasive Species Management Strategy

During the April 11, 2016 regular meeting, Council endorsed Delta’s Invasive Species Management Strategy.  The Strategy provides a framework of how Delta will evaluate, reduce and mitigate the impacts of invasive species on our environment, economy, and society.  The Strategy is divided up in three sections, with goals and action items under each: 1) strategic management, including prevention, mapping and inventory, early detection, and rapid response; 2) control and restoration: regulations, monitoring and replanting; and 3) education and collaboration. View the staff report and the Strategy.

Invasive Species Councils

Delta is a member of the Invasive Species Council of BC (ISCBC). The ISCBC was initiated after the creation of the Invasive Plant Strategy for British Columbia. The strategy outlines information and initiatives to combat the exponential increase in damage and threats caused by invasive plants.

Delta also sits as a Board Director for the Invasive Species Council of Metro Vancouver, which is a regional weed committee that concentrates its efforts within the boundaries of the Metro Vancouver Regional District.

Plant Management Programs

Delta's invasive plant management programs include the seasonal agriculture weed control program, participation in the B.C. Spartina Working Group, and work with local community groups to facilitate invasive species removal.

Delta's Seasonal Agriculture Weed Program operates late May to mid August. As part of the program, the following invasive plants are removed and new locations are inventoried:

  • Canada thistle
  • Bull thistle
  • Scotch broom
  • Giant hogweed
  • Tansy ragwort
  • Japanese knotweed
  • Policeman's helmet
  • Yellow-flag iris

Invasive Plant Details

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  • English Ivy
  • Spartina Anglica
  • Giant Hogweed
  • Japanese Knotweed
  • Garlic Mustard

What You Can Do

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  • Report
  • Volunteer
  • Garden
  • Remove
  • Dispose
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