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Common Buckthorn
Rhamnus cathartica

Dog Strangling Vine (Vincetoxicum rossicum) photo by Ken Towle
Dog-Strangling Vine
Cynanchum rossicum and Cynanchum louiseae

Garlic Mustard
Alliaria petiolata

Giant Hogweed (Heracleum mantegazzianum) photo by  Karen Rimmer
Giant Hogweed
Heracleum mantegazzianum

Himalayan Balsam (Impatiens glandulifera) photo by Jan Samanek, State Phytosanitary Administration
Himalayan Balsam
Impatiens glandulifera

Invasive Ground Covers

Invasive Honeysuckles

Invasive Phragmites (Phragmites australis subsp. australis) photo by Wasyl Bakowsky
Invasive Phragmites
Phragmites australis subsp. australis

Japanese Barberry
Berberis thunbergii

Japanese Knotweed
Reynoutria japonica var. japonica

Japanese Stiltgrass
Microstegium vimineum

Pueraria montana

Miscanthus sinensis & M. sacchariflorus

Purple Loosestrife
Lythrum salicaria

Wild Chervil
Anthriscus sylvestris

Wild Parsnip
Pastinaca sativa

Winged Euonymus
Euonymus alatus

Terrestrial Invasive Plants

Terrestrial PlantsTerrestrial invasive plants are plants that have been moved from their native habitat to an introduced area where they are able to reproduce quickly and crowd out native species. These plants impact our forests resulting in economic, ecological or social disruption.

Terrestrial plants in a forest ecosystem can be a tree, shrub or herbaceous plant. These plants are introduced and spread by infested packaging material, seed dispersal by both environmental and human sources, or by escaping from gardens.

Terrestrial plants impact Ontario’s biodiversity, as well as our economy, agriculture, forestry, and outdoor recreational activities.

You can help prevent the spread of unwanted terrestrial plant species.

  • Learn to identify terrestrial invasive plant species that are a threat to Ontario and how to effectively manage these species on your property. See The Landowners Guide to Controlling Invasive Woodland Plants
  • Avoid using invasive plants in gardens and landscaping
  • Buy native or non-invasive plants from reputable garden suppliers. Native plants provide habitat and food sources for native wildlife. See Grow Me Instead: Beautiful Non-Invasive Plants for Your Garden
  • Dispose of invasive plants in the garbage. Do not put them in the compost or discard them in natural areas. Discarded flowers may produce seeds
  • When hiking, prevent the spread of invasive plants by staying on trails and keeping pets on a leash
  • Report all sightings to the Invading Species Hotline 1-800-563-7711 or report a sighting online

Icon of Quick Reference Guide to Invasive Plant Species Quick Reference Guide to Invasive Plant Species (2.5 MiB)

Tartarian Honeysuckle (Lonicera tatarica) photo by Patrick Breen, Oregon State University Dog Strangling Vine (Vincetoxicum rossicum) photo by Greg Bales, Ministry of Natural Resources (MNR) buckthorn-common-1-credit-credit-valley-conservation-authority Garlic Mustard (Alliaria petiolata) photo by Ken Towle Himalayan Balsam (Impatiens glandulifera) photo by Jan Samanek, State Phytosanitary Administration