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Trillium cernuum

nodding trillium

Melanthiaceae Eastern North America

Attracts Pollinators

Native to North America

SunPart Shade – Full Shade

WaterMedium

HardinessZones 3–7

Overview

Trillium cernuum is a spring-flowering woodland perennial 8-18 inches (20-45 cm) tall, growing from a short rhizome. A single stem bears a whorl of three broad, diamond-shaped leaves 2-5 inches (5-13 cm) long near the top. One flower hangs on a curved stalk that bends below the leaves, so the bloom is partly hidden when viewed from above. The flower has three white, sometimes pink-tinged, wavy-edged petals 0.5-1 inch (1.3-2.5 cm) long with dark red-purple anthers at the center. Flowering occurs from April to June. The flower is followed by a red, berry-like fruit. The plant takes several years to reach flowering size from seed and dies back to the rhizome by midsummer. It grows on moist, shaded forest floors and spreads slowly, forming scattered groups rather than dense stands.

Native Range

Native to eastern North America from Newfoundland and Quebec west to Manitoba and south through the northeastern and north-central United States to the Appalachians. Grows on moist, shaded floors of deciduous and mixed forests, swampy woods, and stream banks in rich, humus-laden soils.

Suggested Uses

Grown in shaded woodland and native plant gardens among ferns and other spring wildflowers, spaced 8-12 inches (20-30 cm) apart. It flowers in spring then dies back, leaving gaps that later-emerging plants can fill. It suits moist woodland sites and does not grow in dry or sunny conditions.

How to Identify

Recognized by a whorl of three broad, diamond-shaped leaves and a single white to pink-tinged flower on a stalk that curves downward below the leaves, hiding the bloom from above. The petals are wavy-edged, 0.5-1 inch (1.3-2.5 cm) long, with dark red-purple anthers. The nodding flower below the leaves separates it from white trillium (Trillium grandiflorum), whose larger flower is held upright above the leaves.

Appearance

Size & Dimensions

Height8" - 1'6"

Width/Spread8" - 1'

Reaches mature size in approximately 6 years

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~2 weeks

Spring

Flowers from April to June, with timing earlier at low elevations and in the south of its range. Each flower lasts about 1-2 weeks, and the plant dies back by midsummer. Cold late springs delay flowering.

Detailed Descriptions

Flower Description

white to pink-tinged

Foliage Description

green

Growing Conditions

Sun Requirements

SunPartial Shade SunFull Shade

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

Soil Requirements

pH Range5.5 - 7.0(Neutral)

357912

Soil Types

loam peat

Drainagewell drained

Water & Climate

Water Needs

Medium

Frost Tolerance

hardy

Time to Maturity

4-6 years

Care & Maintenance

Care Guide

Grows in partial to full shade in moist, humus-rich, well-drained forest soil. Water during the spring growing period to keep the soil moist; the plant draws on spring moisture and goes dormant by midsummer. Acidic to near-neutral soils with a layer of leaf litter suit it. It spreads slowly by rhizome and by seed dispersed by ants, taking several years to reach flowering size. Picking the flower or cutting the leaves removes the season''s stored energy and can set the plant back for several years. Deer browse the foliage and flowers.

Pruning

No pruning is needed. The leaves yellow and die back on their own by midsummer and are left in place. Removing or cutting the foliage reduces the plant''s stored energy and weakens it in following seasons.