🌻 Introduction

Convolvulus arvensis is a twining, rhizomatous perennial reaching 20-120 cm, producing funnel-shaped white to pink flowers 15-25 mm across from May through September on roadsides, cultivated fields, and virtually every type of open ground across Europe and much of the temperate world. Possessing one of the most formidable root systems of any European weed, with rhizomes penetrating to depths of 5-9 metres, field bindweed is considered among the top 10 most difficult agricultural weeds globally.

Stems are slender, twining or trailing, smooth, reaching 20-120 cm when climbing, or spreading prostrate over 1-2 m. Leaves are alternate, sagittate to hastate, 2-5 cm long, with pointed basal lobes projecting backward, on short petioles. Flowers are solitary or in pairs in leaf axils, funnel-shaped, 15-25 mm across, white to pale pink, often with 5 radiating pink stripes from the base to the petal margins, with a faint sweet scent. The fruit is a small globular capsule 5-7 mm across containing 2-4 dark brown seeds. The root system is legendary: a central taproot descends to 5-9 m depth with lateral rhizomes spreading horizontally at 30-90 cm depth, producing new shoots at intervals.

Quick Facts

🔍 Identification Guide

The small funnel-shaped flowers (15-25 mm) with pink stripes on white ground distinguish field bindweed from the larger Calystegia sepium (Hedge Bindweed) which has pure white flowers 40-70 mm across with large inflated bracteoles below the calyx. Convolvulus arvensis lacks bracteoles entirely. The sagittate leaves with pointed basal lobes are smaller (2-5 cm) than Calystegia (5-15 cm). The prostrate or low-climbing habit differs from the vigorous hedge-top growth of Calystegia.

Flower Anatomy

Detailed Morphology

The corolla is fused into a funnel (infundibuliform), pleated in bud with 5 faint external ridges corresponding to the 5 petal midribs. Five stamens are inserted at the base of the corolla tube with hairy filament bases. The ovary is superior, 2-locular, with 2 ovules per locule. The style divides into 2 linear stigmatic branches. Seeds are 3-4 mm, angular, dark brown, with a rough surface, remaining viable in soil for 20-50 years. The root system includes both thick storage roots (to 2 cm diameter) and fine lateral rhizomes with adventitious buds every 5-10 cm.

🧬 Taxonomy & Classification

Convolvulus arvensis belongs to a genus of approximately 200 species in Convolvulaceae, mainly in Mediterranean and tropical regions. The family includes the important crop sweet potato (Ipomoea batatas) and the ornamental morning glories (Ipomoea spp.). C. arvensis is distinguished from the segregated genus Calystegia (which has bracteoles enclosing the calyx) by molecular and morphological characters. Two varieties are sometimes recognised: var. arvensis (hastate leaves) and var. linearifolius (narrow leaves). Chromosome number is 2n = 48 or 50.

🐝 Bloom & Pollinators

Flowering from May through September with peak bloom in June-July. Individual flowers open in early morning, remain open for one day, and close by evening, not reopening. Each flower produces 2-4 seeds. The plant can also reproduce prolifically from root fragments: pieces as small as 2 cm and 0.5 g can regenerate into new plants. The root system stores enough carbohydrate reserves to survive 3 years of complete defoliation, making this one of the most persistent perennial weeds in agriculture.

Pollinator Relationships

Pollinated by small bees (Halictus, Lasioglossum), hoverflies, and small moths. The sweet scent attracts pollinators from several metres. Nectar is produced at the base of the corolla tube and is accessible to short-tongued insects. Self-pollination can occur when the stigma contacts pollen from the same flower, ensuring seed set even without pollinators. The Convolvulus hawk moth (Agrius convolvuli) visits the flowers at dusk with its 12 cm proboscis, though this large moth is an infrequent migrant in northern Europe.

Bloom Details

🔎 Similar Species

Calystegia sepium (Hedge Bindweed) has much larger white flowers (40-70 mm) with two large inflated bracteoles below the calyx, and climbs to 3 m through hedges. C. silvatica has even larger flowers (60-90 mm). Ipomoea purpurea (Common Morning Glory) is an annual with larger purple, pink, or white flowers and heart-shaped (not sagittate) leaves. Fallopia convolvulus (Black Bindweed) twines similarly but has small greenish flowers and belongs to Polygonaceae, not Convolvulaceae.

Known Look-Alikes

🌍 Native Range & Habitat

Native to Europe and Asia, naturalised on every inhabited continent, and listed among the world's worst weeds by the FAO. Colonises roadsides, arable fields, vineyards, orchards, gardens, railway embankments, and all disturbed ground from sea level to 2,700 m. Tolerates a wide range of soils but prefers well-drained, fertile, neutral to alkaline substrates. The extensive root system allows access to deep soil moisture, enabling survival through severe drought. Thrives in hot, continental climates.

Range & Habitat

🗺 Distribution Map

Native distribution of Field Bindweed (range: Europe and Western Asia). It has been invasive species in Worldwide.

🌱 Growing from Seed

Never deliberately plant field bindweed. Seeds germinate at 15-25 degrees over 14-28 days with rates of 50-70% after scarification to overcome the hard seed coat. Natural seed bank persistence of 20-50 years ensures long-term presence in soil. If bindweed establishes uninvited, focus all effort on control rather than cultivation. Seeds are spread in contaminated soil, compost, and on agricultural machinery. Sterilise any soil or compost known to contain bindweed seeds before use.

Propagation Methods

• Seed

Seed Starting Guide

🏡 Garden Cultivation

Do not cultivate. Field bindweed is one of the most pernicious garden weeds and should be controlled whenever it appears. The deep root system makes eradication extremely difficult. Regular removal of all above-ground growth throughout the growing season will gradually deplete root reserves over 3-4 years. Glyphosate applied to actively growing foliage in midsummer provides partial control but rarely eradicates established plants. Never rotovate or dig bindweed-infested soil, as this distributes root fragments that each become new plants.

Site Requirements

Additional Traits

• Self-seeding — will naturalize in suitable conditions

🤝 Companion Planting

Field bindweed is the antithesis of a companion plant, competing aggressively with all neighbouring species for light, water, and nutrients. Its twining stems strangle young crop plants and smother low-growing ornamentals. In vineyards and orchards, it reduces crop yields by 20-50% when uncontrolled. The only context in which it provides value is as a nectar source for beneficial insects, but this benefit is vastly outweighed by its competitive damage. Do not tolerate near cultivated plants.

🦋 Wildlife Value

Despite its weedy character, field bindweed provides useful pollinator resources. The flowers are visited by numerous small bees and hoverflies. The Convolvulus hawk moth (Agrius convolvuli) uses it as a nectar source during migration. Seeds are eaten by ground-feeding birds. The dense mats provide shelter for ground-dwelling invertebrates. Larvae of the bindweed plume moth (Emmelina monodactyla) feed within the folded leaves. In biodiversity terms, the plant supports a modest invertebrate community but displaces more ecologically valuable native vegetation.

Wildlife Interactions

• Nectar source despite weedy status

🌿 Conservation

Least Concern globally and one of the most secure plant species, requiring no conservation action whatsoever. The species is actively controlled in agriculture worldwide. Resistant to most herbicides except glyphosate, and even glyphosate achieves only partial control. Biological control using the bindweed gall mite (Aceria malherbae) has been released in North America with limited success. The species demonstrates the notable persistence of deeply rooted perennial plants in the face of determined human eradication efforts.

📅 Seasonal Interest

Growth resumes from deep rhizomes in April-May, with twining stems appearing above ground. First flowers open in late May, with peak flowering in June-July. Sporadic flowers continue through September. Foliage dies back after the first hard frost in October-November. The root system remains alive at depth through winter, storing carbohydrate reserves for the following spring. No above-ground winter interest; the plant is completely dormant below ground from November through March.

🏨 Landscape Design

Has no place in any designed landscape. If present, develop a multi-year eradication strategy: regular removal of all above-ground growth every 2-3 weeks through the growing season to exhaust root reserves; or careful application of glyphosate to actively growing foliage when stems are 30-45 cm long. Solarisation with clear plastic in summer can kill roots in the upper 30 cm but deep roots survive. Acceptance is the only option in some situations; managed mowing prevents seed set while tolerating the ground cover.

Design Considerations

• Growth form (Twining, climbing, trailing, vigorous) determines placement in borders and naturalistic plantings
• At 20-120 cm, consider position relative to sight lines and companion heights
• Allow 100-300 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 cultivars exist and none should be developed for this pernicious weed. Wild populations show variation in leaf shape (hastate to linear), flower colour (white to deep pink), and degree of pubescence. The narrow-leaved form (var. linearifolius) is sometimes distinguished in floras. Some ornamental Convolvulus species are grown in gardens, including C. cneorum (silver-leaved, white flowers) and C. sabatius (blue trailing form), but these are completely different plants with no invasive tendencies.

📜 Folklore & Ethnobotany

Surprisingly few folkloric associations for such a widespread plant, perhaps reflecting its status as an unwelcome pest. In medieval European medicine, the root was used as a purgative (laxative), a use documented by Dioscorides and continued through the Renaissance. The leaves were applied as poultices to wounds. In some Mediterranean traditions, a tea from the flowers was given for fever. The twining habit led to symbolic associations with entanglement and obsession in the language of flowers. The plant has no significant food uses.

Traditional & Ethnobotanical Uses

• Traditional purgative — strong laxative
• No safe medicinal use recommended
• Extremely persistent agricultural weed

Medicinal & Herbal Uses

Historically used as a purgative (strong laxative) across European folk medicine. The root contains jalapin-type resin glycosides that stimulate intestinal peristalsis. Dioscorides prescribed the fresh juice internally for jaundice and dropsy. Culpeper recommended it for wounds and inflammation applied externally. The purgative action is strong and unpredictable; internal use is not recommended. Modern phytochemistry has identified alkaloids (tropane derivatives) in trace amounts. No modern herbal practitioner recommends this plant.

💡 Beginner's Guide

If you find field bindweed in your garden, begin control measures immediately before it establishes. Pull all visible growth regularly, every 2-3 weeks, throughout the growing season to exhaust root reserves. Do not dig or rotovate infested ground, as this spreads root fragments. Apply glyphosate to the foliage of isolated plants in midsummer when actively growing. Expect a 3-5 year campaign for control, not eradication. Mulching with cardboard and 15 cm of woodchip suppresses growth but does not kill the roots.

Common Mistakes to Avoid

Growing Tips

Troubleshooting

Established bindweed is one of the most challenging garden problems. The root system can regenerate from fragments and survives at depths beyond any normal digging. Rotovating or digging multiplies the problem by distributing root pieces. Glyphosate gel applied carefully to bindweed foliage among crops avoids damaging adjacent plants. The plant climbs through hedges, shrubs, and perennials, making selective removal difficult; pull gently to avoid damaging the host plant. In severe infestations, consider a full season of fallow with repeated cultivation to exhaust root reserves.

❓ Frequently Asked Questions