|Yams and Sweet Potatoes|
I planted yams in one and sweet potatoes in the other today...you don't actually have to plant whole potatoes. I have had great success over and over from buying organic potatoes from our local health food store and cutting them in chunks making sure there is an eye in each piece and then planting the piece with the eye in it in the soil. It sprouts from the eye of the potato. My potatoes have always been healthy and taste fantastic.
By the way, sweet potatoes are: High in vitamin A and fiber, and low in glycemic index, sweet potatoes won't raise blood sugar at the same level as a regular potato.