This year I built a potato box for the first time. As the plants grew I filled the box in with miracle grow gardening soil. I stopped adding dirt once my box was 4' deep. The plants themselves continued to grow and flower. They looked great. The plants now have died off so I went to get my potatoes. To my surprise there wasn't a one, zero, notta. A box full of roots.
How come I did not get any potatoes?