This herbaceous rhizomatous perennial has upright reddish-green stems with dense foliage and forms a rounded clump. It has large diamond shaped dark green mottled leaves and the white or purplish funnel-shaped flowers appear in spring.

Hardiness zones 6 to 9 

Trillium chloropetalum is naturally found in North America from Washington to central California growing in woodland habitats commonly along water courses. 

It prefers a well-drained deep humus rich moist soil that is acidic, tending neutral in a protected semi shaded position and is frost tolerant but drought tender.

The Giant Trillium is grown for its foliage and flowers. It is planted in small or cottage gardens along shaded borders or used in moist rockeries as a specimen. It is suitable for inland or coastal regions establishing in 3 to 5 years and is long lived. It is also planted in woodland gardens or used in shaded courtyards. ID 3131

Note:
The leaves remain green until they fall and establish clumps are long lived.

Trillium (TREE-lee-um) chloropetalum (KLOR-oh-PEH-tah-lum) 

Liliaceae (lil-ee-AY-see-ee)
Lily Family