Hello, I’m Amanda McNulty with Clemson Extension and Making It Grow. Gosh, those myriad common names never stop for Zephyranthes, but a couple make some sense. Rain lily is perhaps the most appropriate, as these lovely native flowering bulbs often pop up en masse after a soaking spring rain. Another is grass lily. This bulb does have grass-like leaves, thick and shiny, (many lawn lovers can only wish for that) and these bulbs grow so close together that they do make a carpet with that attractive foliage. When the bulb appears, it is about the same height, from eight to fifteen inches tall. Although a single flower only lasts one day, that bulb may send up flowers repeatedly when the stars align and the rains come and soak the ground. The bulbs are extremely toxic, lots of websites have the phrase high toxicity in bold type before they describe their beauty.
Other names for Zephyranthes

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