Michael “Skeeter” Pilarski is a popular permaculture instructor well known as a first class wildcrafter. Skeeter shows off a patch of stinging nettle he is growing intentionally. This is in the fall. He talks about getting three crops out of this patch each year. First, a crop of edible leaves; then a crop of seeds (urinary tract medicine) and finally a crop of root cuttings (prostate medicine). He says that he gets about ten bucks a pound for stinging nettle root cuttings and the small patch will produce about 35 pounds.
Skeeter says that stinging nettles are a dynamic accumulator, accumulating iron and other minerals.