Calystegia sepium

Scientific Name Calystegia sepium
Synonyms Convolvulus sepium
Common Names English: Hedge bindweed, Larger bindweed; German: Echte Zaunwinde, Gewöhnliche Zaunwinde; French: Liseron des haies; Spanish: Correhuela mayor, Campanilla blanca
Description Perennial, rhizome-propagated weed with extensively creeping rhizomes.

Descriptions

Characteristic Features

Flowers have two leafy bracts at the base. Leaves are triangular in outline with 'dog-ears'.

Cotyledons

Large cotyledons if propagated by seeds. The small parts of rhizomes produce roots at the internodes and leaves under favorable conditions.

Stems

Twining or creeping, with runners at the base, 1-3 m (3.28 - 9.84 ft) long, may be with or without hairs.

Leaves

Petioled, alternate, triangular in outline, 5-10 cm (1.97 - 3.93 inch) long, most often found without hairs, pointed tip and distinctive angular bases that are cut squarely across the top (truncate) and resemble the ears of a dog.

Propagatio Organs

Flowers

Usually pure white, large, corolla up to 7 cm (2.75 inch) long, on long peduncles, axillary, open evenings.
Calyx enclosed by two large, green, cordate prophylls.
Scentless.
Larger than flowers of Convolvulus arvensis.

Flowering Period

May - September.

Fruit

Egg-shaped capsule containing 2-4 seeds.

Seeds

Germination usually in spring.

Viability Of Seeds

30 years.

Propagation

Mostly vegetatively by rhizomes, partly by black seeds, shaped like quartered oranges.

Occurrence

Habitat

Stream banks, riverbanks, swamps, marshes, ditches, gardens, fields, thickets, fencerows, and roadsides.

Soil

C. sepium occurs in almost all soils, but likes fresh to moist, nutrient-rich soils.

Additional Crop Information

Cultivated fields, no-tillage fields.

Agricultural Importance

Because of its quick-growth and clinging vines, it can overwhelm and pull down cultivated plants and even small bushes and trees. Hedge bindweed growth faster than Convolvulus arvensis and is a persistent weed. It can rapidly engulf the rows in vines reducing growth and yield. The extensive mass of vines also makes harvest very difficult. It contains purgative materials which have caused mild distress in swine.

Control

Integrated Crop Management

C. sepium is difficult to control with herbicides. It is important to prevent that rhizomes are moved into other fields by contaminated tillage machinery. Regular plowing and stubble cultivation as well as early mechanical weeding decreases population densities.

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