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Black Mustard

Brassica nigra

Please keep in mind that it is illegal to uproot a plant without the landowner's consent and care should be taken at all times not to damage wild plants. Wild plants should never be picked for pleasure and some plants are protected by law.
For more information please download the BSBI Code of Conduct PDF document.

Plant Data

Flowering Months:
JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC
Order:
Brassicales
Family:
Brassicaceae (Cabbage)
Type:
Flower
Maximum Size:
80 centimetres tall
Habitats:
Farmland, gardens, riverbanks, riversides, sea cliffs, seaside, wasteland.

Flower:
֍
Yellow, 4 petals
 
The yellow flowers have half-spreading sepals. Up to 15mm wide. 6 stamens. Pollinated by bees and flies.
Fruit:
4-sided seed pods with a short, thin, slender and seedless beak. The seeds are dark brown and ripen from July to September.
Leaves:
An annual flower with untoothed, bluish-green leaves. The lower leaves are pinnately lobed and the upper leaves are lanceolate. Alternate and stalked. Common in England except the far north. Unusual everywhere else in the British Isles. It's identity can be mistaken for many of the other mustard species.
Aroma:
Almost scentless.
Frequency (UK):
Common  
Distribution Map

Reproduced by kind permission of the BSBI.

Click to open an Interactive Map