Do calla lilies spread once put in the ground because they are tuberous?
Hardiness Zone: 9a
By Nancy from Citrus Heights, CA
Calla lilies are bulbs. They spread through their roots but only if planted in partial shade. Fertilize once a month. Do not overfertilize, it will burn their leaves. Keep evenly moist, but not saturated. They do not like standing in water. Do not let them dry out between waterings.
Yes, callas will "naturalize" very nicely. They need shade some in the summer, but will do very nicely here year-round. They do like to have their feet wet regularly, and do need to not get too dried out. If they die back in summer, don't worry, they'll be back in the fall/winter.