Yellow trillium is a woodland perennial from the southeastern US that grows from an underground rhizome and bears a single lemon-scented yellow flower above three mottled leaves. It needs a cool, shaded, moist woodland spot with rich leafmould and should be left undisturbed to form a colony.
Family
Melanthiaceae (Melanthi family)
Grows as
Bulb
Light
Shade, Part shade
Water
Keep the soil consistently moist during the growing season, but never waterlogged.
Soil
Rich, moist, humus-heavy woodland soil or leafmould, slightly acidic to neutral.
Temperature
Hardy to -15 °C; protect from hot, dry conditions in summer.
How easy
Moderate
Native range
EC. U.S.A.
Climate
temperate
About
Trillium luteum, the yellow trillium or yellow wakerobin, is a species of flowering plant in the bunchflower family Melanthiaceae. It is a member of the Trillium cuneatum complex, a closely related group of sessile-flowered trilliums. The species is endemic to the southeastern United States, especially in and around the Great Smoky Mountains of eastern Tennessee and western North Carolina.
How to grow it
Though hardy down to −15 °C (5 °F), this plant requires a sheltered position with rich, moist leafmould in a shaded, deciduous woodland setting which mimics its native habitat in North American broadleaf forests. It must be left undisturbed to grow into a large colony. It requires some experience to grow successfully, but nevertheless has gained the Royal Horticultural Society's Award of Garden Merit.
Where it grows
Trillium luteum is endemic to the southeastern United States, ranging from southeastern Kentucky to northwestern Georgia, with significant populations in and around the Great Smoky Mountains of eastern Tennessee and western North Carolina. It is especially abundant around Gatlinburg, Tennessee. T. luteum has been widely introduced elsewhere, with known populations in Maryland, Michigan, Ontario, Pennsylvania, South Carolina, and Virginia. There are hundreds of citizen science observations of T. luteum outside of its natural range, especially in Pennsylvania, Maryland, New York, and Virginia. A few disjunct populations of yellow sessile-flowered trilliums in central Alabama have been identified as T. luteum but botanists disagree on this point.
Text excerpted from the Wikipedia article Trillium luteum by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.