Answer: Calla lilies are native to South Africa so while they'll provide lovely summer color in your garden, they won't tolerate your cold winter weather. Callas thrive in a partly sunny bed (shaded from hot afternoon sun), in rich, moist soil. Prepare the soil by incorporating lots of compost or other organic matter that will help hold moisture. Plant the rhizomes 4"-6" deep, 1'-2' apart, in rich, moist soil. In late summer, after flowering is finished, dry them out gradually until the foliage dies back. Then dig and store in dry soil or sawdust, keeping them at 40F -50F degrees. In the spring, after new growth begins, replant outdoors in a prepared bed.
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