Tumbleweed

 are a miscellaneous item in Fallout: New Vegas.

Characteristics
In New Vegas, Tumbleweeds appear as balls of wheat-coloured weeds which roll around the Mojave Desert. Often they can get stuck on things, such as the buildings of Goodsprings. Give them a good kick and set them rolling free again!

A Tumbleweed is very light, so shooting it will make it fly several feet. Because a shotgun shoots many pellets at once, even more for the sawn-off shotgun, shooting it with one will commonly send the tumbleweed flying into the sky so far that it usually disappears from sight before it can be seen landing.

If you jump on top of one (you might need to wedge it in between some props to do this) it strangely makes the same noise as walking on a metallic platform.