Tumbleweed is a plant that grows in desert areas in North America. It breaks off from its roots at the end of its life and then blows around on the ground.
[US]
tumbleweed in British English
(ˈtʌmbəlˌwiːd)
noun
any densely branched plant that breaks off near the ground on withering and is rolled about by the wind, esp one of several amaranths of the western US and Australia
tumbleweed in American English
(ˈtʌmbəlˌwid)
US
noun
any of a number of plants, as the pigweed or Russian thistle, that break off near the ground in autumn and are blown about by the wind