Ohio State University Extension Bulletin 866-98

Identifying Noxious Weeds of Ohio

Bulletin 866-98


Wild Mustard
(Brassica kaber var. pinnatifida)

Habitat: wasteland, roadsides, grain and other fields crops, primarily in northern Ohio

Life cycle: annual annual or summer ann

Growth Habit: 1-2 feet high, branched and erect.

Leaves: Alternate, 2-7 inches long. Lower leaves have petioles and are irregularly lobed and toothed with bristly hairs; upper leaves are smaller and may not be lobed; petioles lacking or short.

Stem: branched near top, bristly

Inflorescence: June - October. 1/2 inch, bright yellow, four-petal flowers borne in small terminal clusters.

Fruit: slender, slightly curved, smooth seedpod about 1 inch long; borne on upper branches

Similar plants: The Yellow Rocket looks similar but has rounded lower leaves that are more heart shaped.

Root: short taproot

The problem is.... Seeds live in the soil for many years. Very common in cultivated fields. Cultivation brings seeds to the surface where they germinate.

Wild mustards bright yellow flowers

Wild mustards bright yellow flowers may be seen during most of the
growing season in Ohio.

Wild mustard


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