I'm building a stacking potato planter instead of needing to pile up soil on the ground. The sprouts will shoot up and you just keep adding soil and potentially new seed potatoes to the bag as they grow. They will stack tall. At the end of the season, you dump the soil and have a whole whack of potatoes! I have 3 bags going so I won't need to harvest everything at the same time. Here's how it goes:
My happy chitted potatoes, ready to go into the ground:
Water and wait to see what happens!