Residents of Cheyenne, Wyoming have been trapped in their homes by mounds of tumbleweeds which blew down from the high plains and blocking residents' doors and prompting a city cleanup project.Tumbleweeds blow into town every autumn, but a city official says this week's dump is noticeable because the winds of Wednesday and Thursday were the first extreme weather after a relatively calm fall season.
The plants break away from their roots in the autumn and are carried by the wind, spreading their seeds as they go.
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