Cut off the faded flower, but keep the stem and leaves, which will continue to produce food for the amaryllis bulbs. Don't worry if the stem oozes sap after cutting, this is normal. Once the stem and leaves turn yellow and die, cut them off.
2. Select an area out in the garden for your amaryllis. They will require an area that gets filtered shade or a few hours of the morning sun. It should have fertile garden soil, which can be provided by amending with potting soil.  If you have a flower bed or vegetable garden, you can plant the amaryllis in there, OR you can plant it in a container - I love this blue one.
3. Once the danger of freezing temperatures has passed, it's time to plant. At the bottom of the planting hole, add some bulb fertilizer, following package directions. In desert climates, it's important to bury the bulb to the top, so that only a 1/2 inch remains above the soil. New leaves will soon emerge that will add a pretty element to the garden.
4. Whenever leafy growth is present, water when the top inch of soil is dry and fertilize monthly using an all-purpose liquid fertilizer at 1/2 the recommended strength.
5. Amaryllis typically bloom in spring when grown outdoors. After the blooms fade, remove them and allow the leaves to remain until they turn yellow and die. At this point, add a layer of mulch, leaving only a 1/2 inch peeking above the soil. Decrease the watering so that soil remains just slightly moist.