Black nightshade

Solanum nigrum

Importance

Indicates nitrogen. Widespread in vegetable crops, sugar beet and peas.

Black nightshade 11. Cotyledons are sharply pointed, hairy and small.
Black nightshade 22. True leaves are also pointed and hairy, dull dark green in colour, often with a purplish tinge.
Black nightshade 33. A bushy annual with white or yellow flowers.