I say potato...

We decided to use Ruth Stout's method: toss the seed potatoes on the ground and cover with a foot or so of hay. Easy, with the added advantage of being able to just lift up the plant, take few small potatoes and put it back down in the hay to keep growing. No digging now and no digging later.

Does it work? We have no idea, we've never tried it this way. We can't hold Ruth accountable, either, I'm sure she's passed away by now.

We put in two varieties: Yukon Gold and Yellow Finn. The hay was from last fall, and it's good and rotten.