Callas appertain to the family of Araceae. They originate from the wetlands of Africa. Bulbs can be planted outdoors or in flowerpots. They need heavy soil, enriched with humus and nutritive substances. It is commonly used the mixture of garden soil, greenhouse soil, and peat. The best soil for the plants is the one that is pH neutral, but they can also grow in mildly acidic or mildly alkaline soil. They need plenty of water, so they need to be watered frequently and abundantly. They also need a lot of nutritive substances, so the supplemental feeding is necessary every two weeks. Due to their exuberant growth, they need a lot of nitrogen. They are lovely and interesting as cut flowers because of their special blooms on their long stems which can sustain in water up to ten days. They can reach the height of 50 centimeters, but the ones that are cultivated to be cut flowers can reach an impressive height of 150 centimeters. Blooms are clustered into yellowish luminous piston. Funnel form wrapper around the piston is actually the white external leaf whose function is to lure insects for pollination. Recently there are the genera with yellow and light or dark pink external leaves.