Genus: Rainflower

Zephyranthes

Photo/Illustration: 
Jenks Farmer
Rainflower (Zephyranthes)
Amaryllidaceae
These 70 species of bulbous perennials often flower a few days after a rainstorm. They are native to the grasslands of the Americas. Their white, yellow, pink, or red star-shaped flowers look like crocuses and are funnel-shaped to tubular and erect. Rain lilies can be grown in a rock garden or a sunny border, or in a cool greenhouse or alpine house.
Noteworthy characteristics:  White, yellow, pink, or red flowers that resemble crocuses. They often bloom a few days after a rainstorm. 
Care:  In the garden, grow in moist but well-drained soil in full sun. Will not tolerate excessive winter moisture. In the greenhouse, grow in full light and water freely during growth. Keep just moist in winter.
Propagation: 

As soon as seeds are ripe, sow at 55° to 64°F. Separate offsets in spring.

Species, varieties and clutivars for genus Zephyranthes

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Rain lily
Zephyranthes reginae
Problems: 

Infrequent.