Milk ThistleSilybum marianum (L.) Gaertn.
- ANPC Rank –
- Moss, Flora of Alberta – Rare
- Global Invasive Species Database – No
- NatureServe Rank – Medium
- Haber, Upland – No
- Haber, Wetland – No
- CWF, Status & Invasive Range – No
- Alberta Revegetation Guidelines – No
- The Nature Conservancy – Yes, w/ ESA
- CBCN – No
- AB Weed – No
Not reported as a problem in Alberta, but does occur here and is a problem in the US. Is grown as an ornamental here.