Growing Calla Lily (House plant)
Set the pot in a sunny window (preferably one that faces south) where your plant will receive 6 or more hours of direct sun each day. Calla Lilies are one of the few houseplants that thrive in wet potting mix. Feel the soil in the pot. If the soil is moist, the plant does not need more water. If the soil feels dry, add water. Bloom begins about 8-16 weeks after arrival, depending upon the amount of light the plant receives. In summer, move the plant outdoors to a spot in full sun (partial shade is best in the South and warm inland areas of the West). Bring indoors before frost. In areas where winter lows do not drop below 10°F, you can plant your Calla Lily in the ground in spring in an evenly moist location.