How to Grow a Giant Calla

Wait to plant a giant calla lily until the temperature remains above 55 degrees in areas outside of the recommended growing zone. In the growing zone, you can plant a giant calla lily at any time.

Find a location with full sunlight in the mornings, but shade during the afternoon. Allow enough space for the giant calla to spread 2 feet and to reach a height around 3 feet.

Enrich the area with 2 to 3 inches of organic matter, such as compost, aged manure and peat moss. Mix these into the top 6 inches of soil. When planting in containers, use a 12-inch-wide pot and a top quality potting soil.

Plant the giant calla lily bulb 4 to 6 inches deep. Water well to settle the soil around the bulb.

Maintain moist, but not soaked soil throughout the growing season, as callas prefer moist soil. Add 2 to 4 inches of mulch around the giant calla to prevent weeds and keep the area moist.

Apply an all-purpose fertilizer specific for flowering plants monthly from spring to fall. Follow the direction on the packaging for amounts to use.

Cut the giant calla flowers for display if wanted during the season, but allow the foliage to die naturally before cutting the entire plant to the ground. The foliage provides needed nutrients to the bulb for next season’s plant.