We tried the potato box method of growing spuds, building the box and planting them in the spring, and then adding sections going up as the vines grew. We had a larger box 3 ft x 2 ft, and a smaller 1 x 1 ft box in the square foot garden.
The larger box was a disappointment. Some potatoes grew in the soil above the ground, but not many. Not looking good for potato boxes as a space-saving way to grow.
But the smaller box worked beautifully, and demonstrated the potential of this growing technique. In that little 1 x 1 ft potato tower, we harvested a 5 gal-bucket of spuds, more than in the larger one! In the photo you can see how the potatoes grew. A success!
We got it right with the soil mix, watering and variety of potato on one, but not the other. More learning curves!