• Wind Cave National Park - Two Worlds

    Wind Cave

    National Park South Dakota

Wildflowers - Wavyleaf Thistle

Wavyleaf Thistle, Cirsium undulatum
Wavyleaf Thistle - Cirsium undulatum
NPS Photo by Jim Pisarowicz
The Wavyleaf Thistle is a native thistle. It is a biennial and prefers well-drained locations.

Did You Know?

fire on the prairie

Fire is an important factor in protecting the prairie. Historically, fires burned across the prairie every 4 to 7 years. Fires burn the small trees that would otherwise march across the prairie and turn the grasslands to forest.