i always thought that one "hilled" potatoes
the first time to have adequate room for the plant to grow new potatoes
. then afterward, the more you hilled them the more prolific your plant would be. (to explain what i mean) if you plant a seed potato
. you hill it---then when the "green" comes thru the soil you hill it again to cover up the growth and there is more dirt area to grow more potatoes
. I am thinking you could do this many times---because I have heard of this method: Plant a seed potato
. when it grows thru the soil, center a tire over it. cover up the growth. when it comes thru the dirt--cover it up again and if/when necessary, add another tire. you can conitnue several times.
then remove the tires in layers and harvest the potaotes.
i have been intrigued with this method since I first heard of it several years ago, but have not tried it yet---has anyone?