To fight boredom over the winter, and to test the horse manure I’ve been composting, I started growing potatoes inside, using the manure and left over feed bags. I just use potatoes from the grocery store. I know they’re not disease certified, but I started gardening late, and didn’t order any disease free certified seed potatoes. It’s going quite well, even with the limited light of winter! For spring, I’ll order certified potatoes.
We’ll also use our manure compost piles to heat water (and the barn, greenhouse, etc) and in a methane digest, so the manure will do double duty.