I'm in 6b and plant some Red Norland and Yukon Gold (or any early type) for new potatoes in late March only using whole, small tubers. For storage, any variety that keeps well can be planted until mid-May or so. I can't plant too late here because of leaf disease taking out the plants in the summer. Sweet potato slips go in at the same time as peppers as the leaves are extremely frost sensitive and the plants love the heat.
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