1 / 6
Overview
A long-lived, deciduous, rhizomatous perennial in the family Melanthiaceae, native to moist coniferous and mixed forest understories from southern British Columbia south through Washington and Oregon to northern California and east to the Rocky Mountains. The specific epithet ovatum means 'egg-shaped,' referring to the shape of the leaves. Plants grow 8–20 inches (20–50 cm) tall in bloom. All vegetative parts occur in threes — a single whorl of three broadly ovate, net-veined, unmottled, sessile leaves 2–7 inches (5–18 cm) long is produced at the top of the unbranched stem. From February through April, a single flower is held above the leaf whorl on a distinct pedicel 0.75–3 inches (2–8 cm) long — this is a PEDICELLATE trillium, meaning the flower has a stalk (distinguishing it from sessile trilliums where the flower sits directly in the leaf whorl). The flower has three green sepals and three pure white petals 1.5–2.5 inches (4–6 cm) long that age progressively to pink and then rose-purple over their 2–3 week lifespan. Mildly toxic: all parts contain saponins and steroidal compounds. WARNING: Do not collect from the wild — western trillium takes 7+ years to flower from seed and wild populations are seriously harmed by picking or digging.
Native Range
Native to moist coniferous and mixed forest understories from southern British Columbia south through Washington, Oregon to northern California, and east to the Rocky Mountains.Suggested Uses
Planted as a native spring ephemeral in Pacific Northwest woodland gardens and shaded forest understory plantings at 12–18 inch (30–45 cm) spacing — purchase only nursery-propagated stock; never collect from the wild. The February–April white-to-pink-to-rose flowers are among the most celebrated and iconic wildflowers of PNW forests. Combines with Achlys triphylla, Tiarella trifoliata, Maianthemum dilatatum, and Cornus unalaschkensis in native PNW forest understory plantings. Of exceptional educational value — the trinity of threes, pedicellate vs. sessile distinction, flower color change, ant seed dispersal (myrmecochory), and extreme slow growth from seed are all memorable teaching features.How to Identify
Appearance
Size & Dimensions
Height8" - 1'8"
Width/Spread8" - 1'4"
Reaches mature size in approximately 10 years
Bloom Information
Blooms February through April for 3–5 weeks — among the earliest native PNW forest wildflowers, often blooming while snow is still present at higher elevations. A single flower per stem, held above the leaf whorl on a distinct pedicel: three pure white petals 1.5–2.5 inches (4–6 cm) long that age progressively to pink then rose-purple over the flower's 2–3 week life. Flowers are lightly fragrant and visited by early-season native bees and flies. Seeds dispersed by ants (myrmecochory) — ants collect seeds attracted by the nutrient-rich elaiosome appendage.Detailed Descriptions
Flower Description
WHITE aging to PINK to ROSE-PURPLE over 2–3 week lifespan; three petals 1.5–2.5 inches; THREE sepals, THREE leaves, THREE petals; Feb–Apr; lightly fragrant; ant-dispersed seeds (myrmecochory); NEVER PICK — loses season's photosynthesis; ⚠️ mildly toxic: saponins cause GI upsetFoliage Description
medium green; SINGLE WHORL OF THREE broadly ovate unmottled net-veined sessile leaves 2–7 inches at stem top; ovatum = 'egg-shaped'; PEDICELLATE — flower on distinct stalk above leaf whorl; takes 7+ YEARS to flower from seed — DO NOT collect from wildGrowing Conditions
Sun Requirements
Tolerates up to 4 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight