So, I planted sweet potatoes ( near Philly, so not exactly the best place, but OK ).
I had them in a 45 gallon plastic trash can that was bought just for this purpose. I used brand new soil, with about 30% compost. There were 2 pounds of fish placed in the can for fertilizer. I also fertilized maybe 3 - 4x over the summer..... The leaves looked fantastically healthy all summer. But when I went to harvest them, all but two of them were about 6 to 8" long and about 1.5 inches wide at the widest. I harvested about 40 potatoes.
Any ideas what went wrong?