I don't grow sweet potatoes at my Long Island plot — the 90—120 day season requirement and the soil warming needs have kept them off my list. This guide draws from NC State Extension, Clemson HGIC, Penn State Extension, and Cornell Cooperative Extension, which publish the most detailed guidance on home sweet potato production across the Southeast, mid-Atlantic, and Northeast.
Sweet potatoes are a warm-season crop that needs a long, hot growing season. In zone 7a they are achievable but require starting slips early indoors, waiting for soil to warm thoroughly, and accepting that you will be racing against first frost at the end of the season. In zones 8—10, they are among the most reliable and low-maintenance vegetables in the garden.
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Variety selection
Ipomoea batatas cultivars vary in flesh color, skin color, and vine habit:
Orange flesh: 'Beauregard' (90 days, the most widely grown commercial variety; early, high-yielding), 'Covington' (95 days, excellent flavor, NC State-bred), 'Georgia Jet' (90 days, performs well in northern zones). Per NC State Extension, 'Covington' and 'Beauregard' are the most widely recommended for home gardens in the mid-Atlantic.
White/cream flesh: 'O'Henry' (100 days, white flesh, mild flavor), 'Murasaki' (95 days, white flesh, red-purple skin; Japanese type with drier texture and nuttier flavor).
Purple flesh: 'Stokes Purple' (110 days), high in anthocyanins. Requires a longer season than orange types.
Bush/compact types: 'Bush Porto Rico' (110 days), produces shorter vines (2—3 feet vs. the standard 8—10 feet). Per Clemson HGIC, bush types are useful where standard vining types would overwhelm a small bed.
Days to maturity: 90 ('Beauregard', 'Georgia Jet') to 110+ ('Stokes Purple', 'Bush Porto Rico').
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