The hybrid Z-to-A Calla Lily Flowering bulbs can develop varying shades of pink, yellow, purple and white coloration. You may wish to order the Z-to-A Mixture Calla Bulb Lily mixture, that means you are not to be limited to order one color of callas only. Many flower stems rise from a large Z-to-A Mixture Calla Lily Flowering Bulb. Planting several colors of Calla lilies together in a flower bed can combine leaf and flower colors effectively, if you buy Z-to-A Mixture Calla bulbs from TyTy Nursery. The bulbs of the Z-to-A Mixture Calla Lily Flowering bulbs are very satisfactory as an outside perennial in zones 8 - 11, and in cooler climates they can be dug up in the Fall and stored dry in a dark box in a cool room.