The potato shed is fully insect proof for a reason. You cannot grow potatoes all year round due to tiny beetles chewing the leaves to bits, so I made a shaecloth shed over the mulch boxes.

Again the mulch boxes are 10 inches of pure cow manure and the spuds placed into this. I do not use the natural ground, too hard, too poor and too much hard work digging it up. It would be nice to add another mulch box frame on top of the lower frame and add another 200 mm of cow manure into that, getting more root feeding soil along the stems, hence more tubers. Might try this idea? The dead leaves is from a black frost we got, even instead the shadehouse the potato tops died off. Sad.