Plant amaryllis bulbs in a 6-inch diameter pot with about 1/3 of the bulb sitting above the soil. Water thoroughly after planting and weekly thereafter. Avoid getting water into the nose of the bulb. Keep the pot in a brightly lit area but out of direct sunlight. Fertilize with a slow-release fertilizer according to the package's directions during the growing season. Cut off flower stalks once the flowers fade.
Amaryllis bulbs are tender bulbs that are left in the ground year-round in U.S. Department of Agriculture Hardiness Map zones 8 to 10. In cooler climates, they are left outdoors for the growing season and brought indoors in the fall, when frost threatens. Plant them in a rich, well-drained soil in partial shade.
Amaryllis bulbs need a rest period in winter. Place them in a storage area with temperatures around 55 degrees Fahrenheit for eight to 10 weeks. Stop watering while the bulb is in storage.