0Burf 8 years ago I know of no variety of sweet potato developed specifically to produce a high yield shoots and leaves. Sweet potato greens just aren't a viable cash crop in most markets. However, it is relatively simple to coerce sweet potatoes to produce an abundance of greens and that is to grow the plants in a nitrogen rich soil. The plants will produce few, if any, tubers but you'll have an abundance of greens. Pelleted chicken manure is ideal to increase the nitrogen content of the soil. Grow in sandy, high mounded rows (at least 8 inches high) with good drainage and plenty of space between each plant. Sweet potatoes love the heat and long warm nights.One other note, sweet potatoes are not in the nightshade family and the greens are not toxic. They aren't even in the same family as regular white potatoes. For the best greens and shoots, pick while still young and tender.