- 1). Order seed potatoes from a mail-order supplier, or get them at a local natural foods market, garden center or hardware store. Avoid buying them at a local grocery or supermarket, as the potatoes may have been treated with chemicals to slow the sprouting process. Store your seed potatoes in the refrigerator until you are ready to seed them.
- 2). A week or two before you are ready to plant them, put the seed potatoes into plastic grocery bags and store them in a place where the temperature is at least 70 degrees F. High humidity will speed up the sprouting process, so keep this in mind when you choose your location.
- 3). When the potato sprouts are 1/4 inch long, cut your seed. Use a sharp, clean knife to cut the potatoes. The potato pieces should be approximately 1 1/2 to 2 oz. Cut them into block shapes, with at least one to two sprouts per block.
- 4). Store the seed blocks for five days at 60 to 65 degrees F in a relatively humid area. This will allow them to callus over and "cure," so that they will be more resistant to rot after planting. Lay a cover of plastic wrap over them to keep them from dehydrating.
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