Red, white or pink flowers adorn the amaryllis plant, adding a festive touch indoors during the cold winter months. Amaryllis bulbs require a well-draining soil rich in organic matter: The bulb requires a high amount of nutrition to replenish itself throughout the growing period. You can mix soil that ensures the plant receives everything it needs to thrive.
Mix two parts loam soil with one part leaf mold or compost. Use healthy garden loam from your garden or purchase loam in bags from a garden center. This creates a soil that is rich in organic matter but does not compact over time.
Add one part perlite to the loam and compost mixture. Substitute vermiculite for perlite if perlite is not available. Perlite helps aerate the soil while helping excess moisture drain. Sand can be substituted, but it does not work as well as perlite or vermiculite.
Fill the amaryllis pot one-third full with the soil mixture. Set the bulb on top of the soil and then add more of the soil mix until the bulb is half-buried.
Water the soil until excess moisture begins draining out of the bottom of the pot. After the initial watering, water only when the top of the soil begins to feel dry to the touch. The organic matter in the soil helps keep the amaryllis roots evenly moist while the perlite prevents the soil from becoming waterlogged.