Hm idk, I live way south so I may have more heat and humidity than yall do. I just planted mine directly in the ground and its been sweet potatoe city for me ever sense. I move them around, get different kinds, they all do well.
My soil can also be a factor. Every area is very different, even a couple of hours drive makes a huge difference. So I guess they aren't fool proof for everyone.
Hm idk, I live way south so I may have more heat and humidity than yall do. I just planted mine directly in the ground and its been sweet potatoe city for me ever sense. I move them around, get different kinds, they all do well.
My soil can also be a factor. Every area is very different, even a couple of hours drive makes a huge difference. So I guess they aren't fool proof for everyone.