Report Appendix A Ontario Weed Act – Schedule of Noxious Weeds
Please note, the Act is generally intended to apply only to those areas where these plants may impair agricultural or horticultural operations.
Common Name Scientific Name
1 Barberry, Common Berberis vulgaris L.
2 Buckthorn, European Rhamnus cathartica L.
3 Carrot, Wild Daucus carota L.
4 Colt’s-foot Tussilago farfara L.
5 Dodder spp. Cuscuta spp.
6 Goat’s beard spp. Tragopogon spp.
7 Hemlock, poison Conium maculatum L.
8 Johnson Grass Sorghum halepense (L.) Persoon
9 Knapweed spp. Centaurea spp.
10 Milkweed spp. Asclepias spp. NATIVE
11 Poison-ivy Rhus radicans L. NATIVE
12 Proso millet, black-seeded Panicum miliaceum L. (black-seeded biotype)
13 Ragweed spp. Ambrosia spp. NATIVE
14 Rocket, yellow Barbarea spp.
15 Sow-thistle, annual, perennial Sonchus spp.
16 Spurge, Cypress Euphorbia cyparissias L.
17 Spurge, leafy Euphorbia esula L. (complex)
18 Thistle, bull Cirsium vulgare (Savi) Tenore
19 Thistle, Canada Cirsium arvense (L.) Scopoli
20 Thistle, nodding spp. Carduus spp.
21 Thistle, Russian Salsola pestifer Aven Nelson
22 Thistle, Scotch Onopordum acanthium L.
23 Vetchling, tuberous Lathyrus tuberosus L.
24 Hogweed, Giant Heracleum mantegazzianum
Report Appendix A Ontario Weed Act – Schedule of Noxious Weeds
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