
T umblegeddon Cow hands, wagon trains, Indian tribes, buffalo herds, there are many icons of the Old West, but none are more a prominent staple of Western movies and American imagination. None say "You gonna pull those pistols or whistle Dixie?" like the twisted balls of dead foliage that roll across deserts and roam the open range: Tumbleweeds. And they may be romantic symbols of our national love affair with the Wild West, but tumbleweeds are invasive weeds called Russian thistle, and many modern-day Westerners are not fans, claiming the Russians taking over. (The weeds, I mean.) Tumbleweeds are complex. They start out fledgling thistle bushes, with beautiful reddish-purple striped stems, tender leaves, and delicate flowers. Animals feed on the succulent new shoots, including mule deer, pronghorn sheep, prairie dogs and birds. Cattle find the shoots tasty as well, and this...