Cirsium arvense

Scientific name: Cirsium arvense


Common names: “Canada thistle”

Plant Type: Herbaceous perennial invasive weed


Zone: All

Light: Full sun – semi-shade

Exposure: Exposed

Soil: Any, dry rocky gravel

Moisture: Moist well drained – dry


Plant Size: H 3-5′ W 3′

Leaf and Stem shape: Erect green stems with spiny toothed leaves

Flower: Numerous small purple flowers in clusters, bearing feathery seeds carried by the wind

Root: Prolific deep white rhizomatious roots

Landscape use: Attracts birds, food for wildlife, grows in recently disturbed sites, generally indicates dry rocky conditions

Propagate: By seed and root

Comments: Terrible weed, don’t shop at a nursery if you see this weed going to seed on the premises, ironically it is not native to Canada, but is introduced from Eurasia, invasive species


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