Canada Thistle is a broadleaf, perennial weed with prickly, lobed leaves. It grows from 1 to 5 feet tall, but its creeping roots can spread nearly 20 feet wide and deep, making it a difficult weed to control. Small purple, rose or white flowers open in clusters above the plant from late spring through fall. The seeds are attached to fluffy tufts of hair, making them easily spread by the wind. Food stored in the weed's roots allows Canada Thistle to survive extended periods of drought.

Where Canada Thistle is Found Geographically

Grows throughout the United States.

Similar or Related Plants

Other thistles, of which there are many.