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When you receive your bulbs, unpack immediately. Prepare your soil by digging and adding some organic material (aged manure, peat, leaf mold, composted bark or wood, etc.). Plant bulbs about 12 inches apart in a sunny location that you can water easily. They should not need to be split up for quite a few years and prefer to be able to form a large clump.
Amaryllis will grow in light shade, but have stronger stems and better proportions in brighter light. Plant with the neck and 1 inch of the bulb above soil level. Press the soil down firmly to stabilize the bulb. Water in well, then wait for the surface soil to dry. Keep just moist until bulb begins to sprout leaves, as it doesn't need moisture when there is no growth to support. You can then water a bit more, but do not over water. Amaryllis prefer not to be sitting in wet boggy soil. Water as needed during active growth periods, about 1/2-1" of moisture per week is a good estimate. In warm regions amaryllis foliage is evergreen and continues to look good year round.
Amaryllis can also be kept in pots and make lovely pot plants, even bringing them inside while they are in flower. Choose a pot (about an 8" size is good for one bulb, or bigger for more than one). Use a good quality potting mix and add some osmocote or similar fertilizer. Amaryllis kept in pots will need to be repotted every second year at least.
When the last flower has faded on the flower stalk, cut the stalk near the bulb. A large amount of watery sap flows out of the hollow flower stalk, which is normal if the plant has been well watered. If you have a large bulb, you may get two or three flowering stalks that bloom over a period of several weeks. Leave the foliage in place -- don't cut it off! The leaves will gather sunlight, create food through photosynthesis and strengthen the bulb for the future. Gradually decrease watering late in summer when the leaves begin to turn yellow. Allow the soil to become completely dry when the foliage has died back.
Amaryllis begin their growth phase in late winter. Water regularly, not letting the soil dry out completely. Apply monthly liquid fertilizer.
In the spring, water daily and apply a slow release fertilizer.