My Russet Potatoes started from potatoes left too long in the pantry. I mounded dirt over the plant as it grew until I reached the top of the pot. Now I will wait,until the plant starts to die, the leaves and flowers will turn brown, that’s when it will be time to dig. Sometimes this can happen because of pests or disease, so its important to note the maturation of potatoes is 6-8 month, knowing this also helps dertimine when it is time dig. Another good time to dig is after your first freeze.