Invasive plants in High Park

Invasive plant species pose some of the greatest challenges to the preservation and restoration of High Park's natural environment. To learn more about how City staff and volunteers are dealing with these species, see Controlling Invasive Plants and High Park Stewards.

Greater Celandine Field. Photo: Sharon Lovett
Greater Celandine Field. Photo: Sharon Lovett

Herbaceous Plants

  • Dog-strangling Vine
  • Garlic Mustard
  • Sweet-white Clover
  • Himalayan Balsam
  • Purple Loosestrife
  • Greater Celandine
  • Japanese Knotweed
  • Hedge Parsley

Shrubs & Trees

  • Common/European Buckthorn
  • Euonymus
  • Asian Bittersweet
  • Tree of Heaven
  • Norway Maple

See also Phragmites

Is this plant native or invasive?

Test your knowledge: guess first and then move your cursor over the photo (or touch the photo) to check your answer.

Canada Anemone

Garlic Mustard

Purple Raspberry

Himalayan Balsam

White Sweet Clover

Meadow Rue

Sassafras

European Spindletree

Black Oak

Norway Maple

Greater Celandine

St John's-wort

Wintergreen

Tartarian Honeysuckle

Glossy Buckthorn

Japanese Knotweed

Garlic Mustard field. Photo: Sharon Lovett
Garlic Mustard field. Photo: Sharon Lovett

Invasive Plants Resources

Quick guides

References and documents

More resources and websites

Articles, Galleries and Guides

What's New?

High Park Stewards Summary 2020

By High Park Stewards | January 1, 2021
Due to COVID-19 restrictions we were limited to holding only 5 of the usual 13 sessions between August and November with a maximum of 8 participants per session. This resulted in…

High Park Christmas Bird Count 2020 Results

By High Park Nature | December 22, 2020
by Bob Yukich. The annual High Park Christmas Bird Count was held on Sunday, Dec. 20, 2020 (a mild cloudy day with no snow-cover). Our route ended up with 51…

Now available – the latest issue of our UPDATE newsletter

By High Park Nature | December 13, 2020
Please see the December 2020 issue of our UPDATE newsletter for a summary of the past year’s news and activities involving the High Park Natural Environment Committee, High Park Stewards…

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