Lamium amplexicaule

Scientific Name Lamium amplexicaule L.
Common Names English: Henbit dead-nettle; German: Stängelumfassende Taubnessel; French: Lamier amplexicaule; Spanish: Ortiga muerta menor, Conejitos, Gallitos
Description Annual or hardy-annual (facultative biennial), seed-propagated weed with deep taproot.

Descriptions

Characteristic Features

Upper leaves enclosing the stem.

Young Plant

See red dead-nettle, tips at the base usually not touching each other.

Stems

Erect, 10-20 cm (3.93 - 7.87 inch) high, ramified below, square, upwards softly haired.

Leaves

Crossed opposed, round-reniform, lower leaf pairs wide apart from each other, long-petiolate, upper leaves enclosing the stem, all reticulately wrinkled, margin deeply notched.

Propagatio Organs

Flowers

Corolla bilabiate, pink to carmine, in dense axillary whorls.

Flowering Period

All year round with mild weather.

Fruit

Nutlets brown, 2 mm (0.078 inch) long, glabrous, 1-seeded, oblong-oval, keeled.

Seeds

Oblong to elliptical, white moldy.
Germination usually in autumn, but also spring. Henbit dead-nettle is a shallow germinator.

Viability Of Seeds

About 5 years.

Propagation

By seeds.
40-200 seeds/plant.

Occurrence

Habitat

Waste ground, lawns, cultivated fields, pastures, roadsides, railroads, vineyards.

Soil

L. amplexicaule likes nutrient-rich, well-aerated lighter, sandy loam soils.

Agricultural Importance

High weed infestation causes yield loss. Mass infestation only occurs in warm areas (vine growing). In cultivated areas that get tilled regularly, the plant can form large patches of pink in the spring. L. amplexicaule prefers warmer areas than Lamium purpurea. The flowers give nectar for bumblebees.

Control

Integrated Crop Management

Mechanical weeding including tiny harrow have high levels of control in the seedling stage.

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