Trillium cuneatum, native to the southeastern United States, has mottled leaves and maroon, banana-scented flowers.  Blooming in early spring, this wildflower prefers rich soils and shade/partial shade.  Zones 4-8.  Quarts.  (Photo courtesy of Tom Barnes, University of Kentucky.)

Trillium erectum, or Purple Trillium, is one of the loveliest Trilliums, with flowers that are mahogany-red to purple. This native wildflower  stands nearly erect, with often more than one stem per plant.  Like all Trilliums, Trillium erectum is perfect for the woodland or wildflower gardens, blooming in May or June in shade.  Zones 4-8.  Quarts.

In my opinion, Trilliums are the stars of the spring woodland garden.  Even though I have had different varieties in my garden for years, I continue to anxiously await their arrival each spring, and I continue to be amazed at their quiet beauty.  It's always almost as if seeing them for the very first time. 
Trillium grandiflorum, a  North American native, is easily recognized by its flowers petals and deeply lobed leaves in groups of three.  Even the berry has three cells -  "tri-llium," get it?  Growing from 10-15 inches tall in shade, Trillium grandiflorum complements other spring blooming flowers, like Helleborus, Virginia Bluebells, Epimediums, and spring blooming bulbs, too.  Trillium grandiflorum will thrive in alkaline soil.  Shade.   Zones  4-8.  Quarts.

Trillium luteum (Yellow Trillium), a  woodland native wildflower, has pale yellow, lemon-scented flowers that sit atop beautiful mottled foliage.  Like the other Trilliums offered,  Trillium luteum is a perfect companion to spring-blooming bulbs and other native wildflowers.  Shade.  Zones  4-8.  Quarts.

Trillium sessile, or Wake Robin,  is stalkless, and the crimson flowers rest atop mottled foliage.   Trillium sessile blooms in early spring with spring bulbs, as well as Helleborus, Epimediums, and Blood Root.  Shade.  Zones  4-8.  Quarts.