Actually, sweet potato spinach is a distinct variety of sweet potato. The tuber is white starchy, is small, root like, and looks inedible. The leaves though taste like and look like the tuber varieties. What makes this variety standout is that it does very well here in clay soils as an understory plant below persimmons, or blackberry muscadine stacks.
Conventional sweet potatoes have trouble with tight soils and certainly don't produce tubers easily in such conditions. I need to put them in a foot of good soil. Additionally, conventional ones lose tuber production if you grow them for leaves.
We got our start from the Chinese Organic Gardening Club here in Houston. See page 550 in Cornucopia II.
Our sweet potato spinach comes back easily in the spring here in zone 9 or (Global Warming 10).
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