Visit a local garden center approximately one week before you plan on planting your potatoes.
Select and purchase certified Irish Cobbler seed potatoes. Certified seed potatoes have been inspected for diseases commonly found in potatoes. Never use potatoes from the grocery store or a friend's garden.
Cut any large seed potatoes into smaller pieces with a paring knife. Be sure each piece has an eye, the part that allows new growth to come from the potato. Approximately 1 1/2- to 2-ounce pieces or whole potatoes are an ideal size.
Place the cut seed potatoes on a cool dark shelf for around one week. This will allow the potatoes to heal over the cut portions, a process is called suberization. You can now plant your seed potatoes in your prepared plot.