Lazy gardener tip I received today, this guy had buried some compost down under 2 feet of soil and there were some potatoes in there. They had a massive harvest! I think this may be common, but I've never heard people suggest a planting depth that far down.
When he was digging through the ground the stem just went and went and went, so I think he was saying he found the potatoes down all the way to a depth of 2 feet, it wasn't that a critter moved the potatoes up higher, they were actually growing that far down.
Community Building 2.0: ask me about drL, the rotational-mob-grazing format for human interactions.
Determinate potatoes are considered fast-growing and produce tubers at the soil depth just above where the seed was planted. Indeterminate potatoes are classified as slow-growing and produce tubers all along the stem where soil exists. Indeterminate varieties are preferred for bag growing so the yield is worth the effort.
And a brief list:
Determinate varieties that work well for a short growing season or a small yield include "Red Pontiac," "Chieftain" and "Yukon Gold" potatoes. Indeterminate varieties include "Russet Nugget," "Nicola," "German Butterball" and "Elba" potatoes.
I've had a "perennial" potato patch now for about 5 or 6 years, I planted them that long ago, and I never was able to find them all I guess, lol. Every year now I get a new crop of them and many are located really deep. The do better if you hill them up, so instead, I dug really deep, and kept covering them until the ground was level again as they grew. I wanted to rotate different crops in that spot, but since they keep coming back every year, I just let them be. Some of the best potatoes I've had. I've got 2 varieties in there, red and Irish cobbler potato.