Wild mustard – Sinapis arvensis

Wild mustard

Sinapis arvensis L.
Brassicaceae (Mustard family)

Life cycle

Erect winter or summer annual.


Seedlings have smooth, kidney-shaped cotyledons and prominently veined, bristly hairy leaves that initially develop from a basal rosette. Lower leaves are irregularly lobed and toothed with petioles; upper leaves are alternate, stalkless to short-stalked with coarsely toothed margins and pointed tips, gradually becoming smaller toward the top.


Erect, up to 3-foot-tall stems bolt from a basal rosette to flower. Stems are bristly hairy at the base, often branched and nearly hairless at the top.

Flowers and fruit

Bright yellow flowers with four petals are found in terminal clusters. Fruit are 1- to 2-inch-long, cylinder-shaped capsules with a four-angled beak at the tip that contain round, black to purple seeds.



Wild mustard plants
Wild mustard stem
Wild mustard flower
Wild mustard fruit
Wild mustard leaf
Wild mustard rosette

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