Tumbleweeds: The fastest plant invasion in the USA's history

> ...tumbleweeds made headlines as strong winds pushed them into towns in Utah and Nevada. They created piles up to three metres high, reaching rooftops in some places.

I was driving outside of...Santa Clara, I think, and saw a gigantic tumbleweed, maybe 5-6 feet in diameter, bouncing down the #1 lane on the road. Had a good laugh for about 10 minutes, as it seemed to be in remarkable control, stayed in its lane, and obviously was in a hurry to get somewhere!