The following plants can cause serious damage to natural areas in Ontario, as identified by the Ontario Ministry of Natural Resources. Do not introduce these in landscaping and remove them if they are already present.
Upland ecosystems
Norway maple | Acer platanoides | |
Scots pine | Pinus sylvestris | |
Black locust | Robinia pseudoacacia | |
White poplar | Populus alba | |
Siberian elm | Ulmus pumila | |
Japanese barberry | Berberis thunbergii | |
Autumn olive | Elaeagnus umbellata | |
Russian olive | Elaeagnus angustifolia | |
Tartarian honeysuckle | Lonicera tatarica | |
Showy bush-honeysuckle | Lonicera X bella | |
Multiflora rose | Rosa multiflora | |
Common buckthorn | Rhamnus cathartica | |
Hoary alyssum | Berteroa incana | |
Smooth brome | Bromus inermis | |
Spotted knapweed | Centaurea maculosa | |
Celandine poppy | Chelidonium majus | |
Sand rocket | Diplotaxis tenuifolia | |
Quack grass | Agropyron repens | |
Orange daylily | Hemerocallis fulva | |
Dame’s rocket | Hesperis matronalis | |
Common St. John’s-wort | Hypericum perforatum | |
White sweet-clover | Melilotus alba | |
Wild parsnip | Pastinaca sativa | |
Bouncing Bet | Saponaria officinalis | |
Mossy stonecrop | Sedum acre | |
Hedge-parsley | Torilus japonica | |
White swallow-wort | Cynanchum rossicum |
Moist ecosystems
European white birch | Betula pendula | |
White mulberry | Morus alba | |
Crack willow | Salix fragilis | |
Glossy buckthorn | Rhamnus frangula | |
Goutweed | Aegopodium podagraria | |
Garlic mustard | Alliaria petiolata | |
Periwinkle | Vinca minor |
Wetland or aquatic
Hybrid willow | Salix x rubens | |
Black alder | Alnus glutinosa | |
European frog’s bit | Hydrocharis morsus-ranae | |
Moneywort | Lysimachia nummularia | |
Purple loosestrife | Lythrum salicaria | |
European water milfoil | Myriophyllum spicatum | |
Watercress | Nasturtium microphyllum | |
Pondweed | Potamogeton crispus |