I planted two varieties of this obscure South American root crop last spring; one white and the other red. They went in a foot apart, in rows two feet apart. It didn't do much till around midsummer, when it started spreading out. It's frost-sensitive, and the tubers don't form till the top growth is dying back. I fleeced it, and meant to harvest it for Christmas. Thanks to the weather and a bad fall, I only got it up a couple of weeks ago.
Yield was very variable, from a pound or so to nothing. I'm not sure why, but some of the tubers I put in were very small. The red hadn't suffered from the frost at all, while white tubers on the surface had gone soggy. There was very little slug damage, and I found none underground. They taste lemony; allegedly they turn sweet if they're left in the sun, but I didn't try this. I'll be planting again shortly. This time I'll use larger tubers, and hopefully I'll do better.
It's interesting that the red did not suffer from the frost so much. They look like Real Seeds Red, the same as I grow, and I did get quite a bit of frost damage with this variety. Still, an unusual winter...