I'm doing a couple of 4 x 4 foot square foot gardens at home. It's been interesting, to say the least. I've planted carrots, spinach (which has already been eaten/yanked), and fingerling potatoes.
The potatoes have been interesting to watch -- the Square Foot Gardening book (by Mel Bartholomew) says to plant 4 potatoes per square (12" x 12"). I barely covered them at first, then as they grew, I piled more and more soil mix/compost around them.There are 3 different varieties of fingerlings in this 4 x 4. It's weird how different potato plants can look.