Amaryllis XL (an amaryllis plant that is larger than the standard size) is the easiest flowering bulb to grow. It should be planted in a pot indoors between October and April. The flowers will bloom between December and June, providing gorgeous winter color. The large, trumpet-shaped blooms last about seven to 10 weeks and range in color between salmon, white, red, pink and orange. There are also several multi-colored varieties, typically in mixtures of pink and white or red and white.
Place the potted amaryllis XL in bright light, because it requires a warm spot. The ideal temperature for the plant is between 68 and 70 degrees Fahrenheit.
Water the flower sparingly and watch for a bud to appear. This typically takes a couple of weeks. Gradually water the plant more and watch the stem growing quickly. Flowers will develop once the stem reaches its full height.
Rotate the pot regularly so the flower stalk grows straight up and doesn't lean in a certain direction. Use a slim bamboo stake if the flower is too top-heavy and causes the stem to bend.
Make the amaryllis XL bloom again once it's done flowering. Cut off the old flowers with pruning shears or scissors. Once the stem begins to sag, cut it down to the top of the bulb, at soil level.
Water and fertilize the amaryllis for at least five months, throughout the summer. Let the leaves re-grow and cut them off when they start to turn yellow in the early fall.
Use shears to cut the leaves down to a height or two inches above the bulb. Remove the bulb from the pot, clean it and store it in a cool, dark place.
Remove bulbs and replant them after six weeks. Expect it to take 8 weeks for them to bloom again.