Like most plants, amaryllis plants grow better in certain types of soil, and over a period of 1–3 years they may remove the nutrients from their soil. While it is not difficult to get an amaryllis to rebloom, you may have a larger, healthier plant if you use a special potting mix. Amaryllis roots are easily harmed during transplanting, so if you are not used to transplanting flowers you may wish to replace the top 1/2 inch (1.25 cm) of soil instead.
The best soil for amaryllis consists of two parts loamy soil, without much sand or clay; one part perlite or gravel; and one part organic matter such as rotted manure, peat, leaf mold, or composted bark. A clay pot might be better than a plastic one, since the amaryllis can become top-heavy and tip a lightweight pot over. If you are replanting the amaryllis in your garden, remove any dead leaves and peel off the bulb sheaths. Place the plant in the soil with the bulb shoulders exposed, and give it a drink of water. This will help “wake” the amaryllis up.