Calla or arum lilies (Zantedescia aethiopica) are native flowers from southern Africa. These elegant flowers, with their sculptural shape, are commonly used in weddings. But they are beautiful for all sorts of occasions and work as a great focal point in floral arrangements. Calla lilies are available in shades of pink and cream, yellow, green, terracotta orange, and dark purple. They also come in a miniature size, mini calla lilies.
Calla lilies are delicate, so take care when transporting them. As with most flowers, start with a clean vase. Take your calla lilies, re-cut the stems, remove foliage that will be below the water line, and put flower food into the vase water. Once you have the flowers arranged, keep them away from direct sunlight and air vents. After a few days (2-3), change water, recut stems, and clean vase. Check your arrangement daily for dying blooms and foliage, remove immediately.
[image from phil wood]
For more information, Flowers and Plants UK