Trillium ovatum

Trillium ovatum

· perennial · native

Last updated

Data Maturity Baseline

This profile contains verified botanical data. Regional field notes and expert review are in progress.

Western trillium is a native perennial found from central California north through the Coast Ranges to Vancouver Island and southwestern British Columbia. It represents the most widespread and abundant trillium in western North America, with three white petals that age to pink or purple.

Western trillium grows in moist, shaded woodland conditions and prefers humus-rich soil. It is slow to establish and spreads gradually via rhizome offsets. The plant requires patience in cultivation and performs best in undisturbed forest floor conditions.

Field Observations

Trillium ovatum - in flower
Field Observation
Trillium ovatum · Western Trillium
in flower
April 25, 2026 · Soos Creek Botanical Garden · 1,580 GDD₃₂ · BBCH 65

Quick Facts

Origin
Western North America

Phenological Calendar

Stage Typical Window
in flower BBCH 65