https://www.ontario.ca/document/weed-identification-guide-ontario-crops/spiny-annual-sow-thistle
Spiny Annual Sow-Thistle | Weed identification guide for Ontario crops | ontario.ca
Apr 2, 2026 - Use this guide to help you identify common weeds and learn how to minimize their impact on your crops.
annual sow thistleweed identification guidefor ontariospiny