Worth, I've yet to see this happen. At least to the extent that some people claim. I've tried more than once, but for me it's been mostly a waste of growing medium.
I think my problem is that they dry out when I try to stack the soil too high. Automated watering would probably help.
With you living in one of the warmer climates, I would imagine that you would have no trouble with sweet potatoes; just a thought. I love sweet potatoes.
Charlie
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