Make certain bulb and soil are dry before repotting. Off-shoots can be removed and repotted separately at this time. Use a small pot in relation to the bulb size. Many gardeners prefer a four inch pot or a shallow azalea-type pot. A pot is generally considered large enough if there is room for an inch of soil between the inside edge of the pot and the bulb.
Amaryllis like to be slightly rootbound.
A thorough watering is essential immediately after potting. Maintain the bulb in a slightly moist soil condition until flowering. When flowering starts, increase the frequency of waterings to prolong flowering. Container-grown amaryllis can be transplanted outside as soon as the danger of frost has passed. Planting in the Garden Amaryllis will grow in almost any good garden soil as long as it is well-drained.