When blooms fade, cut off the tubular flower stems near the top of the bulb, leaving the foliage to continue growing.
Water as usual and apply water soluble fertilizer every four weeks. After danger of frost sink the Amaryllis pot in the garden in a sunny place for the summer, continue to fertilize.
At the end of summer, place the pot on its side and allow the soil to dry out. Cut off the dry leaves, and in about six weeks repot your bulb in fresh potting oil and start the growing cycle again. (This step is important!).
Place 2 inches of the growing medium in the bottom of the pot. Set the Amaryllis in the pot. Gently pack the soil between the roots and around the bulb, leaving approximately one third of the bulb above the oil line. (Be careful not to plant too deep!).
Water sparingly until the sprout is well out of the bulb. Then water regularly and your Amaryllis will produce its spectacular huge flower. Remember to keep turning the pot regularly to make the stalk grow straight as they have a tendency to grow toward the light.
An Amaryllis stake is nice to have!
I was pleased that mine actually came back this year, using these directions. Below is mine: