After the blooms have faded and the leaves begin to yellow, discontinue watering and allow the plant to dry completely. Store the plant in a cool dry area (basement is best) through the fall. About mid-December, remove the tubers from the soil. If they appear firm and healthy, replant them in sandy soil (4 parts sand mixed with 1 part peat) in a slightly larger pot. Water well moist. Give the plant lots of light, even full sun, and maintain the recommended temperature (55-70° F.) Feed moderately until the blooms appear.If you live in a temperate climate area that has warmer winters, you may be able to plant the calla lily outdoors. Plant it outdoors in a sunny area (with good water drainage) in the spring as soon as all danger of cold temperature has passed. Give it some fertilizer, keep the soil moderately moist and hopefully, you will get new growth and blossoms in the spring. Compared to some of the other bulbs and tubers, the calla lily tubers are more likely to rot if excessive moisture is present. Be sure you have good drainage, whether you replant in a pot or outdoors.