I can verify that sweet potatoes grow very well on the gutters. This is a picture of the ones I harvested yesterday. Some are nearly 2 pounds. The deeper color ones were from some purple sweet potatoes I purchased while in Florida. They sprouted, so I grew out the slips. This year I grew them in 10 gallon grow bags, because last year they were so wedged in the pails I had trouble getting them out. This worked much better.
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