06Field guide
Ontario Invasive Plant Species
How to recognise the invasive plants most often encountered on Ontario roadsides, wetlands, corridors and properties — how they spread, and what management involves.
SP / 01Invasive PhragmitesPhragmites australis subsp. australisEuropean Common Reed forms dense stands in wetlands and roadside ditches and is one of the most difficult invasive plants to manage in Ontario.View species profile →
SP / 02Japanese KnotweedReynoutria japonicaA rhizomatous perennial that regenerates from very small fragments, making mechanical removal one of the most common ways it spreads.View species profile →
SP / 03Giant HogweedHeracleum mantegazzianumA very large invasive plant whose sap can cause severe skin reactions in sunlight, requiring careful professional handling.View species profile →
SP / 04Wild ParsnipPastinaca sativaA yellow-flowered roadside invader whose sap causes burns in sunlight, common along Ontario road corridors and field edges.View species profile →
Additional guides in development
- Dog-Strangling Vine
- Common Buckthorn
- Garlic Mustard
- Purple Loosestrife
Next step
What's growing on your site?
Tell us what you are dealing with and where. We'll help determine the right next step.
Invasive Veg Solutions Inc. — Northeastern and Central Ontario