Canada Thistle

Overview

Canada Thistle (Cirsium arvense) is an invasive, climatically adaptable plant species. It is native from Eurasia, and now widely distributed throughout North America. It has bluish green, waxy leaves, grows up to 40-50 cm tall in a clump. It has several hollow purple stems with sharp prickles. Flowering occurs in late summer, producing small white to violet or purple flowers. Canada Thistle is adapted to a wide range of climates and is difficult to eradicate. It can spread rapidly and can outcompete native vegetation. Managed programs of control are the most effective way to reduce its impact.

Care Guide