Tumbleweeds are organic decorative items that generate on the surfaces of desert biomes.
How to Obtain
A quick swipe of your pick or shovel will do the trick.
How to Use
If you have a mechanical cat, it is recommended to place a tumbleweed at the bottom of a strand of rope and then dangle it in an interesting way over the cat's head. Chances are the cat will appear completely disinterested, but secretly it will have noticed your attempt to entertain it, which in the long run can only work in your favor.
Tumbleweeds were released in June 2013 with the desert biome update.