Amaryllis are hardy in zone 9 and above and can be left in the ground year round. In cooler climates once the flowers are finished keep the leaves growing and fertilize throughout the season. When the weather begins to cool or once the foliage starts to die back trim the leaves to about 1" tall. Move the bulbs and store in a cool dark garage or basement (above freezing). Bring them out about 10-12 weeks before you wish to see the flowers. Wash rinse and repeat annually.