In this publicity photo provided by Cool Springs Press, cabbage and other 

In this publicity photo provided by Cool Springs Press, cabbage and other vegetables planted in straw bales are shown in Minnesota author, Joel Karsten's garden. Karsten is the leading evangelist of a straw-bale gardening movement that has become one of this summer's hottest gardening trends. (AP Photo/Cool Springs Press, Tracy Walsh/Poser Design)
Associated Press
In this publicity photo provided by Cool Springs Press, cabbage and other vegetables planted in straw bales are shown in Minnesota author, Joel Karsten's garden. Karsten is the leading evangelist of a straw-bale gardening movement that has become one of this summer's hottest gardening trends. (AP Photo/Cool Springs Press, Tracy Walsh/Poser Design)
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