In warmer climates (zoes 8-10), calla lilies grow well in partial shade (4-6 hours) to full sun (6-8 hours). In cooler climates (zones 3-7), they enjoy full sun.

Keep your Calla Lily consistently moist but not in soggy soil. Use filtered, bottled, or tap water that is sitting 24 hours to release the chemicals and water enough to discharge out of the drainage holes. Once the water is fully drained, replace it into the cache or decorative pot. 

The Calla Lily enjoys and thrives in average humidity.

Comfortable room temperatures  will help the Calla Lily to thrive.

Outside: Place in bright, indirect light if grown in a greenhouse and flowering so the leaves don't burn. Inside: Set in bright, indirect light.

Rhizomes planted in containers: Apply a liquid fertilizer especially formulated for flowering bulbs at half strength every two weeks in a container. Rhizomes planted in the garden: Add an organic fertilizer such as bone meal rich in phosphorus, calcium, and a trace of nitrogen. These nutrients will help the roots establish. 
 

If growing in a planter container, use a well-draining potting soil with perlite to aerate the soil. Add amendments to clay soils in the garden to aerate the soil and allow for good drainage. 

Cut the leaves back after the first frost when the foliage turns yellow. Trim back faded flowers to the base of the stem. 

Divide the rhizomes in the spring after the last frost in your planting zone. Plant each rhizome (type of root system) in a deep container at least 3-4 inches deep with soil underneath it for rooting. Set the growing tips facing upward. Cover with well-draining soil (add amendments to heavy soil in the garden). Wait until the plant is producing new green leaves before starting to fertilize. Stop fertilizing when buds form.