Sweet Potato Box

I read that it is possible to grow 100 pounds of potatoes in 4 square feet.  So, I bought the lumber and made the box - 2 feet by 2 feet, with a pile of boards to add as the plants grow, making the whole thing eventually 2-3 feet tall.  You are supposed to be able to harvest from the bottom while the top continues to grow.  We shall see.

Just the other day I added my second layer of boards, and some more dirt.

I'll have to take a better picture later - so the whole box is visible.  But this is a start.