Thlaspi arvense

Scientific Name Thlaspi arvense L.
Common Names English: Field penny-cress, fanweed, french weed, penny-grass, stinkweed, mithridate mustard; German: Acker-Täschelkraut, Acker-Hellerkraut; French: Herbe aux écus, tabouret des champs; Spanish: Carraspique
Description Annual, sometimes over-wintering, seed propagated weed.

Descriptions

Characteristic Features

Young plant forms rosettes. The fruit is almost circular, like a penny coin. Field pennycress smells like garlic when leaves are crushed .

Cotyledons

Round-to-oval, short-stemmed, smooth-edged, slightly curled tip.

Stems

Individual stems, sharply angled, branching above.

Leaves

Lower leaves an inverted oval in shape, stemmed, forming a flat rosette on the soil; upper leaves long with an arrow-shaped base, indented or large-toothed.

Propagatio Organs

Flowers

Small, white flowers in an inflorescence (cluster) which later elongates.

Flowering Period

Spring-early summer.

Fruit

Almost circular, flattened pods with a "wing" all around.

Seeds

Germination is all year round.
Seeds are brownish-black, grooved, and oval.

Viability Of Seeds

10-30 years.

Propagation

500-2,000 per plant; surface germinator at a depth of up to 1 cm (0.39 inch).

Occurrence

Habitat

Grain fields, clover, hay fields, grasslands, gardens, roadsides, and waste places.

Soil

Prefers slightly acid, humus-rich soils and sandy loams.

Additional Crop Information

Also on waysides.

Agricultural Importance

T. arvense has low competitive ability, therefore the conomic weed threshold is high (40 plants per m²; 3.7/sq. ft.). Nevertheless, it is a significant agricultural weed which strongly competes with crops for moisture and space, often emerges in high densities and causes remarkable reductions in yield.

Control

Integrated Crop Management

Mechanical methods at early growth stages result in good control of this weed species.

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