To get the most from a vegetable garden, many gardeners opt to save seeds for planting the following year. When it comes to potatoes, rather than collecting seeds, a few potatoes can be prepared and stored for the next spring. To save seed potatoes, however, you'll want to be sure to select healthy potatoes from healthy plants to keep the chance of disease down.
Harvest your potato crop from healthy plants by digging them up with a pitchfork and lifting the potatoes to the surface. Sort through the potatoes to collect the ones that are egg-sized or smaller.
Look over the smaller ones to make sure they are firm without cuts or any signs of damage or rot. Keep only the best looking potatoes to be your seed potatoes.
Set the seed potatoes out in the sun for a few hours to dry. Use your hands to gently brush away any excess soil from the skin without pressing so hard you rip or damage the skin.
Place the potatoes in a dry window for two to three days to encourage them to go dormant. After a few days have passed, set the potatoes into an empty cardboard egg carton and close the lid.
Store the potatoes in a dry, dark place with good air circulation where they can sit until the following late winter or early spring. Check on the potatoes once a week and pull out and discard any that are rotting.