Stop watering when the foliage yellows and allow the bulb to begin a dry, dormant period. Cut off the dead foliage and place the bulb in a cool, dark place until the fall. It must have about a three-month dormancy to bloom again. After dormancy, repot in a fresh mixture so the bulb neck is above the soil level. Select a clean clay pot, with a drainage hole two inches larger in diameter than the amaryllis bulb.
Blooms are best if the bulb is slightly pot-bound.
Fill the container with a good potting mix. The soil line should be about an inch down from the top of the pot. Amaryllis prefer a humus-enriched, sandy soil that is slightly acidic. Add 1-2 tablespoons of superphosphate to each gallon of potting mix. Water and gradually move the pot to brighter light.