|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.|
Young plant forms rosettes. The fruit is almost circular, like a penny coin. Field pennycress smells like garlic when leaves are crushed .
Round-to-oval, short-stemmed, smooth-edged, slightly curled tip.
Individual stems, sharply angled, branching above.
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.
Small, white flowers in an inflorescence (cluster) which later elongates.
Almost circular, flattened pods with a "wing" all around.
Germination is all year round.
Seeds are brownish-black, grooved, and oval.
Viability Of Seeds
500-2,000 per plant; surface germinator at a depth of up to 1 cm (0.39 inch).
Grain fields, clover, hay fields, grasslands, gardens, roadsides, and waste places.
Prefers slightly acid, humus-rich soils and sandy loams.
Additional Crop Information
Also on waysides.
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.
Integrated Crop Management
Mechanical methods at early growth stages result in good control of this weed species.
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