Tropical in origin, sweet potatoes do require ample heat over a long season (at least four frost-free months), but they can be grown successfully at higher latitudes with a little extra attention. Plant into beds covered with black plastic mulch to help warm the soil, and cover new plantings with row cover, which also protects the plants from browsing deer. Johnny's sells certified (inspected for disease and insect pests) sweet potato slips, which are shoots that have been sprouted from seed stock roots.
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