Tumbleweeds Aren't Always Tiny
Tumbleweeds are technically dead, but they hold thousands of viable seeds that scatter as the dried plant rolls across the land. The most iconic species of tumbleweed is Kali tragus, or Russian thistle. It arrived in America from Russia in the late 1800s, and swiftly invaded the West and Midwest.
from National Geographic
Key Facts In This Video
A mature tumbleweed can have 250,000 seeds inside it, each one protected by a sharp thorn. (0:19)
Tumbleweeds came to America from Russia, hence the name Russian thistle. (0:37)
Follow a pair of photographers on their journey to find tumbleweeds: (1:02)