I saw the leaves on my sweet potato had died off. I figured that meant dig them up? My bounty was not all that large...should I have waited longer? I will say this was not in a tower or small container like my potatoes which may have something to do with it. I am going to go out on a limb and say containers/towers tend to be easier to maintain. They also grew larger bounties then my fellow gardeners who planted their potato seeds in the ground. But this was my first endeavor to sweet potatoes so what gives? Why the small bounty?