How do I over-winter calla lilies indoors?
Calla lilies (Zantedeschia spp.) are tender perennials. Their rhizomes must be dug up in fall and stored indoors over the winter months. After a killing frost, cut off the foliage 1 to 2 inches above the soil surface. Carefully dig up the rhizomes. Do not cut or injure the rhizomes. Dry the rhizomes in a warm, dry location for 1 to 2 weeks. After drying, bury the rhizomes in vermiculite, sawdust, or peat moss. Store the rhizomes in a cool (50 to 60 degree Fahrenheit), dry location.