My Dad told me this..since
My Dad told me this..since I'm a Grandma, this is a Really old 'hint' his Dad used in farming too... place half potatoes on top of tilled soil, cover with straw about 2 to 3 feet deep. As it deteriorates, keep at the high level by adding straw. The potato tops will grow up thru the straw and 'most' of the potatoes will root along the top of the ground. Pull of straw when the potato vines turn dry. Did up any that dug themselves into the ground... but Most will be on top of the soil.