Plant the bulbs in the fall four to eight inches deep; plant deeper in sandy soil or if you live in a marginal growing zone and want to ensure hardiness. These bulbs also thrive when planted in a state of active growth, which gardeners appreciate as they can see the foliage and blooms before making a purchasing decision. 

As with many small flowering bulbs, rain lilies look best when planted in large drifts. On the other hand, if you have a small garden and can’t afford to dedicate that much real estate to one flower type, a group of a dozen rain lilies looks splendid tucked in beside a boulder, or peeking out between other sun-loving summer flowers