Protect them from frost, give them a constantly moist spot, and then dig and overwinter them if you’re in a growing zone north of Zone 8, and you too will be able to make your own romance in the garden in a range of colors from passionate red to purest white.
When & Where to Plant Callas
Plant rhizomes of callas in the late spring, when danger of frost is plant, covering with 1-2 inches of rich, humusy potting soil.
Select a part-shade spot in an area that benefits from constantly moist soil such as the edge of a pond, or in a container water feature. If planting in pots, use an organically-rich potting soil that drains well but retains moisture.
In zones where it can overwinter, such as in the Pacific Northwest, the white species type (Zantedeschia aethiopica) will not only spread but can be considered a bit of a pest. Unless dug in colder zones, it will perish when the temperatures plunge and must be brought inside. Growth is significantly lessened in this case.
Light: A partly-shaded spot is ideal, as too much direct sun on leaves and flowers can burn them. However, the plant needs light to bloom well, so deep shade is not a good option.