Ah, I see. I'm using raised beds, and the media is mostly the decomposed remains of piles of mulch the local tree trimmers brought a few years ago. The compost is loose and friable, so I was able to just reach my hand under and pull out potatoes. Having helped dig them as a kid, that was particularly fun for me! I believe this year I will grow them closer together, and harvest every other one for new potatoes.
Tom, are there any varieties you recommend? For various reasons- storage, vigor, etc.?