Native from Texas to Argentina, these bulbous plants sprout and bloom almost immediately following a summer rain (thus their common name). Their trumpet- to funnel-shaped blossoms closely resemble those of their relatives, Zephyranthes. Plant bulbs in spring or summer in well-drained soil, spacing them 3 in. apart, with tips at soil level. Plant in sweeps for best effect. Good plants for the front of borders, in rock gardens, or in naturalized areas. In areas where ground freezes in winter, grow in pots. Best with winter moisture and dry summers with occasional downpours.
H. brachyandrus. Blooms from early summer to fall. Lavender-pink, 3-in.-long flowers with shades of blackish purple at petal bases are borne one per stem.
H. xfloryi. Hybrid between H. brachyandrus and H. robustus. 'Purple Base' is the selection usually offered; it has blue-green foliage and 2- to 3-in.-long, rosy pink flowers with crimson-purple throats atop 15-in. stems. Blooms intermittently all summer.
H. robustus. Blooms midsummer to fall. Flowerssometimes borne two to each 9-in. stemare 3 in. long, light pink with green throats and deeper pink veining. 'Russell Manning' is an especially floriferous, large-flowered selection that multiplies quickly.
H. tubispathus (H. andersonii). Summer bloomer with 112-in.-long flowers in yellow veined with red. Stems and leaves about 6 in. high. 'Cupreus' is coppery orange; H. t. texanus, known as Texas copper lily, has bronzy yellow flowers.