The flower most gardeners call an amaryllis is the Hippeastrum, a bulb often grown indoors, especially during the winter holiday season. It is noted for how quickly it grows. Another noted character of this amaryllis is the fact it prefers a snug fitting pot, and often produces its lovely and largest blossoms when pot-bound. For this reason, the amaryllis does not need to be repotted annually. Overtime the bulb will produce offsets, which can be removed and repotted.
Schedule the repotting after the plants have gone through a rest or dormant period.
Allow the bulb and soil to dry before repotting.
Choose a relatively small pot. When the bulb is place in the pot, there should be about an inch from the outside of the bulb to the inside edge of the pot.
Mix together equal parts coarse sand, loamy soil and leaf mold in a bucket. Make enough to fill the pot. Or purchase a potting soil at the gardening center designed for bulbs.
Carefully remove the old bulb from its pot and remove any offsets (new, smaller bulbs). Avoid disturbing the root system.
Place broken pot shards on the bottom of the pot, to prevent soil from slipping from the hole when watering the pot.
Add soil mixture to the bottom of the pot, enough so that when the bulb is set on the soil, the top of the bulb will be level to the pot's brim.
Center the bulb, roots down, on the soil and carefully add soil around the sides of the bulb. Do not cover the bulb neck, leave about ½ to 2/3 of the bulb neck exposed, above the soil line.