🌻 Introduction

Silene latifolia (syn. Melandrium album) is a dioecious herbaceous perennial of the Caryophyllaceae, native across Europe, western Asia, and North Africa. Male and female flowers are borne on separate plants; white flowers 2.5-3.5 cm across open in the evening and release a sweet, clove-like fragrance to attract nocturnal moth pollinators. Plants grow 30-100 cm tall, blooming May to October in hedgerows, road verges, field margins, and waste ground.

Stems are erect, branching, and covered with soft hairs. Leaves are opposite, ovate-lanceolate, 3-10 cm long, softly hairy on both surfaces. Male flowers have a tubular calyx with 10 veins and 5 teeth; female flowers have a swollen calyx with 20 veins and 5 broad teeth that enlarges around the developing capsule. Petals are white, 12-18 mm, deeply bifid (2-lobed), with coronal scales at the limb base. The capsule is 15-25 mm, ovoid, opening by 10 revolute teeth.

Quick Facts

🔍 Identification Guide

Dioecious habit (separate male and female plants) is the key identifier once flowers are open. Male flowers have 10 exserted stamens; female flowers have 5 protruding styles and a swollen calyx. The evening-opening, white, fragrant flowers distinguish it from Silene dioica (red campion), which has pink unscented flowers opening during the day. Calyx venation (10 veins on male, 20 on female) is diagnostic.

Flower Anatomy

Detailed Morphology

The sex chromosomes of S. latifolia are among the largest in the plant kingdom: the Y chromosome is the largest known plant chromosome, approximately 570 Mb. Male flowers have 10 stamens in two whorls; female flowers have a single ovary with 5 styles. The capsule contains 150-300 seeds, each 1.2-1.5 mm, kidney-shaped, with rows of tubercles. Seeds are dispersed by wind-shaking from the erect capsules.

🧬 Taxonomy & Classification

Previously classified as Melandrium album or Lychnis alba before being placed in Silene, where molecular studies confirm it belongs. Silene is one of the largest genera in Caryophyllaceae, with about 700 species. S. latifolia is closely related to S. dioica, and the two hybridise freely (the hybrid is named Silene x hampeana). Chromosome number is 2n=24, with heteromorphic sex chromosomes (XX female, XY male).

🐝 Bloom & Pollinators

Flowers open at dusk and remain open through the night, closing partially the following morning. Each flower lasts 3-5 days. Fragrance production peaks at midnight, dominated by lilac aldehydes and benzenoid compounds. A single female plant can produce 5,000-15,000 seeds per season. Sex ratios in natural populations are typically 1:1 but can shift under environmental stress.

Pollinator Relationships

Primarily pollinated by nocturnal moths, especially the genus Hadena (campion moths), which have a unique nursery pollination relationship: adult moths pollinate while laying eggs in the ovary, where larvae consume some developing seeds. Other night-visiting moths (Noctua pronuba, Autographa gamma) also pollinate. Diurnal visits by bumblebees and hoverflies are secondary. Wind pollination is negligible.

Bloom Details

🔎 Similar Species

Silene dioica (red campion) has pink (not white) flowers that open during the day and are unscented. Silene vulgaris (bladder campion) has a large, inflated calyx and smaller, non-fragrant white flowers. Saponaria officinalis (soapwort) has pink flowers with entire (undivided) petals and lacks dioecism. Stellaria holostea (greater stitchwort) has smaller white flowers with bifid petals but is not dioecious.

Known Look-Alikes

🌍 Native Range & Habitat

Native from western Europe to central Asia, growing in hedgerows, field margins, road verges, waste ground, and open woodland edges from sea level to 1,500 m. It is ruderal-competitive, colonising disturbed ground and field edges. Soil preferences are broad: pH 5.5-8.5, sandy to clay. It is naturalised in North America and parts of South America.

Range & Habitat

🗺 Distribution Map

Native distribution of White Campion (range: Europe, Western Asia, North Africa). It has been naturalized in North America, Australia.

🌱 Growing from Seed

Sow in autumn or spring on raked soil; germination occurs in 14-21 days at 15-20 degrees Celsius without pretreatment. Seeds need light, so do not bury. Sow at 0.5-1 g per square metre in wildflower mixes. Both male and female plants must be present for seed set; sow generously to ensure both sexes establish. Seedlings flower from the second year.

Propagation Methods

• Seed

Seed Starting Guide

🏡 Garden Cultivation

Plant in full sun to light shade on any well-drained soil. Tolerates poor, sandy ground and mild drought. Space 30-40 cm apart. The evening fragrance makes it excellent near patios and seating areas. Can become weedy through self-seeding; deadhead female plants after flowering if spread is unwanted. Cut back old growth in late autumn.

Site Requirements

Additional Traits

• Self-seeding — will naturalize in suitable conditions

🤝 Companion Planting

Combines naturally with Silene dioica (red campion) in hedgerow and woodland edge mixes; the two species hybridise where they meet, producing pink-flowered offspring. Pair with Oenothera biennis and Saponaria officinalis for an evening-scented garden. In meadow mixes, include with Leucanthemum vulgare and Centaurea nigra. It provides food for nocturnal pollinators that other flowers miss.

Recommended Companion Plants

🦋 Wildlife Value

A critical food source for nocturnal moths, including the nationally scarce campion moth (Hadena rivularis). The nursery pollination system with Hadena moths is one of the best-studied insect-plant mutualisms in Europe. Seeds are eaten by finches and buntings. The hairy foliage hosts aphids that in turn support ladybird populations. Caterpillars of the campion moth feed inside the developing capsules.

Wildlife Interactions

• Night-blooming nectar source for moths
• Dioecious — separate male and female plants

🌿 Conservation

Not globally threatened but declining in intensive agricultural landscapes where hedgerows are removed and road verges sprayed with herbicides. An important component of farmland boundary biodiversity. Its nocturnal pollination system makes it uniquely valuable for moth conservation. Maintaining wide, unsprayed field margins and hedgerow bases benefits populations. Listed in hedgerow seed mixes for ecological restoration.

📅 Seasonal Interest

Basal rosettes of soft, hairy leaves persist through winter in mild areas. Stems elongate in April-May. Evening-scented white flowers appear from May, peaking June-July. Swollen capsules on female plants are visually interesting through August-September. Plants die back by November.

🏨 Landscape Design

Ideal for wildlife hedgerow mixes and boundary plantings where evening scent is valued. Plant near patios, bedroom windows, or garden seating for fragrance at dusk. Include in moth-garden plantings alongside Lonicera periclymenum and Nicotiana sylvestris. Suitable for wild areas, road verge restoration, and woodland edge plantings.

Design Considerations

• Growth form (Erect, branching, hairy) determines placement in borders and naturalistic plantings
• At 40-100 cm, consider position relative to sight lines and companion heights
• Allow 25-40 cm spacing for natural spread
• Low-maintenance choice for naturalistic or xeriscape plantings
• Will naturalize by self-sowing — ideal for meadow and prairie-style gardens

🏷️ Varieties & Cultivars

No horticultural cultivars are in mainstream trade; the wild type is used in seed mixes. The naturally occurring double-flowered form is extremely rare. Hybrids with S. dioica produce a range of pink shades. Some seed companies offer mixed Silene latifolia/dioica blends for hedgerow restoration. Selection for larger flowers has not been pursued.

📜 Folklore & Ethnobotany

Known as 'white campion' in English, the evening-opening flowers were associated with fairies and the supernatural in British folklore. Picking the flowers at night was said to bring bad luck. The plant featured in medieval love divinations: a girl who picked white campion at midnight on Midsummer Eve would dream of her future husband. No significant medicinal history.

Traditional & Ethnobotanical Uses

• No significant medicinal uses
• Model organism for sex chromosome research

Medicinal & Herbal Uses

No significant history of medicinal use. The plant contains saponins common to the Caryophyllaceae but in insufficient quantities for practical application. Historically mentioned in some herbals as a poultice for boils, though efficacy is undocumented. Not used in modern herbal medicine. The plant is not toxic and poses no health risks.

💡 Beginner's Guide

Easy to grow from seed scattered on bare soil in autumn. No special care needed once established. Locate near a seating area to enjoy the evening fragrance. Remember that only female plants produce seed capsules; males have smaller, flatter flowers with visible stamens. Allow some self-seeding for a natural look but remove excess seedlings if spreading too far.

Common Mistakes to Avoid

Growing Tips

Troubleshooting

Self-seeding can be vigorous on disturbed soil; hoe unwanted seedlings in spring. The campion moth (Hadena) larvae eat developing seeds, reducing seed production by up to 30%; this is a natural interaction and should be tolerated. Smut fungus (Microbotryum) can replace anthers with purple-brown spore masses; remove and destroy infected plants to prevent spread. On very shaded sites, plants become etiolated and flower poorly.

❓ Frequently Asked Questions