When Are Lilies in Bloom?

Bloom Time Vocabulary

• The period that a lily -- or any flower -- blooms is expressed in terms of early, mid or late-season for that genus. The lily season runs from the middle of June through early September. Most garden lilies are hybrids that have specific bloom periods. They are descended from species lilies, some of which are native to the United States and others native to Europe and Asia. Bloom times occur throughout the summer for the dozens of species lilies planted as garden plants in their native ranges.

Species Lilies

• The panther lily, or Lilium pardalinum, which grows in the coastal ranges of California, blooms early and mid-season from mid-May through July. The Turk's cap, or Michigan, lily, scientific name L. michiganense, on the other hand, blooms mid- to late season, from July through August, over a wide range as far south as Mississippi, north to its namesake, Michigan, west to Oklahoma and east to New York. Another western lily, Humboldt's lily, L. humboldtii, blooms mid-season in late June and July, as does the eastern Canada lily, L. canadense. The exotic Southern red lily, L. catesbaei, blooms mid- to late July through September along the Southeastern coastal plain. Bloom times and spans vary in areas where species lilies are not native.

Hardy Lilies

• In addition to species like the towering Michigan lily that grows 5 feet tall and blooms through early September, and L. martagon species and hybrid lilies that bloom very early from late May through June, two hybrid lily types grow successfully in USDA hardiness zones 3 to 5. Asiatics, hardiest of the hybrids, bloom in June and early July; newer hybrids extend the bloom into August. Bowl-shaped blooms appear in a broad range of jewel-like colors, many freckled. As plants mature, 3 to 4-foot stems may bear a dozen blooms. Trumpet and Aurelian hybrid lilies produce funnel-shaped flowers on tall stalks from mid- to late summer. Trumpets and Aurelian lilies' dark or iridescent exteriors add to their drama but they often require winter protection.

Temperate Zone Hybrids

• Less hardy lilies were once limited to pots in flower shops, but when crossed with hardier varieties, they provide variety for temperate-zone gardeners. Longiflorum, sold as Easter lilies, crossed with Asiatics, make "LA' hybrids, trumpet-shaped, colorful mid-season bloomers. "AO," Asiatic-Oriental hybrids, bloom mid-season. "OT," or orienpets, cross Oriental and trumpets and thrive in warmer zones and bloom from late July through August. American hybrids grow best on the West Coast and are strong mid-season bloomers, bearing spotted, recurved blooms.