Linnaea spp.

twinflower

Linnaeaceae Circumboreal Northern Hemisphere

Attracts Pollinators Fragrant (light)Container Friendly

Native to North America

SunPart Shade – Full Shade

WaterMedium

HardinessZones 2–6

Overview

Linnaea spp. is a genus in the family Linnaeaceae, classically containing the twinflower, Linnaea borealis, a slender evergreen creeping subshrub of cool northern forests; some modern treatments broaden the genus to include several shrubs formerly placed in Abelia spp. and related genera. The twinflower forms low, trailing mats only 1-4 inches (2.5-10 cm) high, spreading by thread-like stems that root as they run, with small, rounded, paired evergreen leaves. In early to midsummer, slender upright stalks 2-4 inches (5-10 cm) tall each carry two nodding, bell-shaped pink to white flowers that are fragrant, especially in the evening. The genus grows in cool, moist, acidic soils rich in organic matter, in the partial shade of coniferous and mixed woodland across the cold-temperate and boreal Northern Hemisphere. It depends on cool roots, steady moisture, and low competition, and declines in heat, drought, or disturbed ground. The shrubby species included in broadened treatments are larger, with arching stems and clustered tubular flowers.

Native Range

The twinflower, Linnaea borealis, is circumboreal, native across the cool and boreal regions of North America, Europe, and Asia, growing in coniferous and mixed forests, on mossy banks, and in cool, shaded ground; broadened treatments add shrubby species from eastern Asia and the Himalayas.

Suggested Uses

The twinflower is grown as a groundcover in cool woodland and shade gardens, on mossy banks, and in alpine and trough plantings where summers stay cool. It is used in native-plant and conservation plantings in northern regions, while the shrubby species are used as flowering shrubs in mixed borders.

How to Identify

Recognize the twinflower form of Linnaea spp. by creeping, thread-like evergreen stems carrying small, rounded, paired leaves and forming low mats. Each slender flowering stalk forks at the top to hold two nodding, bell-shaped pink to white flowers. A faint sweet scent, strongest in the evening, and cool northern woodland habitat confirm it.

Appearance

Size & Dimensions

Height1" - 4"

Width/Spread1' - 3'

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~4 weeks

Summer

The twinflower flowers in early to midsummer, generally June to July, with paired bell-shaped flowers nodding on forked stalks. Flowers are fragrant, particularly in the evening, and last several weeks. Small dry fruits follow, dispersed by clinging to fur and feathers.

Detailed Descriptions

Flower Description

Pink to white

Foliage Description

Dark green

Growing Conditions

Sun Requirements

SunPartial Shade SunFull Shade

Requires 2-6 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 Range4.5 - 6.0(Acidic)

357912

Soil Types

loam peat

Drainagemoist

Water & Climate

Water Needs

Medium

Frost Tolerance

hardy

Time to Maturity

2-3 years

Care & Maintenance

Care Guide

Linnaea spp. grows in cool, moist, acidic, humus-rich soil in partial shade, mirroring the floor of a coniferous forest. The twinflower needs cool roots, steady moisture, and shelter from hot sun, and spreads slowly by creeping rooted stems. It does poorly in heat, drought, alkaline soil, and competition from vigorous plants. A mulch of leaf litter or conifer needles keeps roots cool and moist. The species is hardy well into the cold zones, roughly USDA zones 2 to 6, but is intolerant of warm-summer climates.

Pruning

No formal pruning is needed for the creeping twinflower; stray runners can be trimmed or lifted to keep mats in bounds. Shrubby species in broadened treatments are trimmed after flowering to shape the arching stems. Dead growth is cleared in spring.

Pruning Schedule

summer