Sweet potato seems to sprout pretty easily in our dark room. We use the dark room for bulk food storage - since we have no pantry! We've had these two sweet potato in the dark room for around 6 or more months now. We've pulled most of the shoots off these two, and they're starting to re-shoot again already.
We planted the shoots into the ground horizontally, then covered them with a juice container with the bottom cut out. Hopefully the earwigs stay away from these!
Last night, one of the sweet potato finally made an appearance! Hooray!
Sweet potato generally grows in tropical or sub-tropical areas, so being in a temperate area, we're not expecting to harvest much at all - if any. It's really an experiment at this stage. :)
I'll let you know how it goes, of course!