The calla lilies(Zantedeschia aethiopica ... common names, Calla lily, Arum lily, Varkoor, an Afrikaans name meaning pig's ear); grows from bulbs, or rather rhizomes, and will therefore, as most other bulbs, spread by producing even more bulbs. These bulbs can be dug up, and replanted in another location. The calla lily is a very hardy and strong genus that will grow in more or less any soil as long as it the climate is humid enough. In many of the countries from where the calla lily originates it is thought of as a weed and is ferociously cut down to make way for agriculture. The calla lily can also be propagated through its seeds but it takes a little more finesse than to just dig up those extra bulbs.