Early maturing varieties, especially in southern Kansas, are favorable so tuber development is complete prior to the summer heat. Cut the tubers into 1 ½ to 2-ounce pieces and store in a warm, humid location for two to three days. This time allows the cut to heal and prevents rot.
For the best success plant when the soil is at least 45 degrees F. Space seeds 12 inches apart in rows 3 feet apart in fertile, well-drained soil. Seeds should be planted two inches deep. Potatoes require regular watering.
Practice crop rotation, if possible, by avoiding planting in an area where tomatoes, peppers, eggplant, potatoes or tomatillos have been planted in the past three to four years.
As potatoes develop along the main stem protruding from the seed, pull loose soil up, or apply straw mulch, over the potatoes. This will prevent them from being sunburned. They will be ready for harvest when the vines are about half dead. (Kansas Garden Guide)