Here in central Wisconsin I grow sweet potatoes in a raised bed. I cover the soil with plastic to help the soil heat up. Still have curly potatoes in various sizes. Haven't figured out why yet but I do have enough produce out of 18 plants to last the winter. Cure under the same white plastic loosely laid over the potatoes to protect them from any early frost. Next year hoping to use windows over the raised bed to form a small greenhouse. I'm from the south also so I understand you moms plight. Look into straw bed gardening. Its been a tremendous success for me. Good luck with your growing seasons!
Here in central Wisconsin I grow sweet potatoes in a raised bed. I cover the soil with plastic to help the soil heat up. Still have curly potatoes in various sizes. Haven't figured out why yet but I do have enough produce out of 18 plants to last the winter. Cure under the same white plastic loosely laid over the potatoes to protect them from any early frost. Next year hoping to use windows over the raised bed to form a small greenhouse. I'm from the south also so I understand you moms plight. Look into straw bed gardening. Its been a tremendous success for me. Good luck with your growing seasons!