Zephyranthus 'Citrina' 

This is an Amaryllis relative native to the Americas.  Great outdoors in the south, excellent for indoor pots and plants.  Tolerates any soil type. EASY to grow.  Blooms several times each summer, after heavy rains (hence their common name "Rain Lily"). Hardy in zones 8-11, elsewhere dig and store for the winter.

Bulbs are naturally small but blooming size.  These will multiply quickly and set seeds.