I've brought in a couple of pots with sweet potatoes to see if I might be able to keep them happy enough to overwinter indoors. They did not grow sufficiently to produce tubers of any size this year (we're light-limited in my area, even in shade-free spots). I have a half-hearted grow-light set up, as in I refuse to buy another bit of gear so am asking a lot of plants to share one light. It's a cost-free trial, just seeing how we make it through. Last year, it worked for lemongrass

Anybody else have any suggestions? Did you find it better to keep rooted cuttings in water or plants in soil, to keep sweet potatoes going?
thanks