Native to Central and South America, amaryllis counts over 80 hybrid species with flowers simple or double, large or average-sized, with varied colors. Planting depends on the season and whether you’re going for pot or ground-growing.
Read also:

Bulb size, for Amaryllis, determines quantity and height of flower stems. Smaller bulbs will develop one or two stems 12 to 16 inches (30 to 40 cm) tall, while larger bulbs will produce up to five stems more than 20 inches (50 cm) tall.
Once the bulb is planted, water just a little bit and place the pot in a sunlit room where the temperature is mild (70 to 75°F (21 to 23°C)), near a radiator eventually.

This spectacular bloom can last over four weeks. If you work to prolong the blooming, it can even reach eight weeks!
As soon as the stem appears, pull the plant away from any concentrated heat source and water more to keep the soil slightly moist.
Once in full bloom, flowers usually need to be attached to stakes because they are too heavy for their stems. As the flower grows and blooms, keep watering and add geranium fertilizer for your amaryllis to develop harmoniously.

Read also:
I live in the hill country of Texas is may to late to plant bulbs?
Hi Leslie, honestly, it’s rarely too late to plant anything! In this case, Amaryllis will still be able to start and might even flower in fall if the warm season extends a bit. In the worst case, it’ll simply sprout leaves this year, and then wait out the winter underground, and only bloom next year, but I doubt it: you’ll very certainly have flowers this year still.