Answer: This is the problem with trying to grow sweet potatoes in the northern cold climates with shorter growing seasons. Sweet potatoes require a warm soil and warm temperatures to grow. Using a raised bed and covering it early in the spring with black plastic can help the soil warm faster, also make sure it is well drained as a heavy and overly wet and cold soil is really not optimum for sweet potatoes. At this point, it is a matter of wait and see. You might try erecting a mini hoop house over top to serve as a cold frame on cold nights (open it for venting during the day) and try to keep the soil warming as fast as possible that way. Good luck!
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