Natural History Wanderings

INteresting Facts writes

Watching an old Western might leave you with the perception that tumbleweeds have always been a part of America’s western landscape. However, many of the spiky bushes are actually an invasive species from Russia. Salsola tragus goes by a variety of names — including “Russian thistle” and “wind witch” — but its best-known title comes from the way the plant breaks free from the ground at the end of its growing season, blowing around and spreading hundreds of thousands of seeds. While some native tumbleweeds do exist — like Amaranthus albus, aka common tumbleweed — Russian thistle is highly invasive, a term scientists use to describe species that choke out native plants and cause ecological harm by altering habitats. Today, Russian thistle is the most common type of tumbleweed in California.

Read more at The iconic tumbleweed of the West is not native to North America.