Regional Noxious. Annual or winter annual.
Wild mustard has bright yellow, four-petal flowers in small clusters
sitting on thick stalks. The stems are branched near the top and have
upper leaves that are toothed and lower leaves with deep lobes,
both hairy underneath. Mature plants are 0.3 - 1 m tall.
Wild mustard can invade cereal and other field crops as well as
disturbed areas. It reduces crop yields, lowers crop value, and can reduce
livestock forage production on pastures.
In British Columbia, wild mustard is found at lower elevations
at the coast and Interior grasslands, where it grows on fields and disturbed
habitats. In other areas it is commonly found in crops and along roadsides.
It is rare in southwestern and south central BC, but it is considered
a major concern to the Peace River agricultural region.
Wild mustard is spread by seed. Each plant produces 2,000 - 3,500
seeds that may remain viable in
the soil for several years.