Search

Content tagged with "weed"

Photo of black mustard flower cluster

Black Mustard

Brassica nigra
Next time you breeze past weedy black mustard on the highway or spot it in a fallow field, think of how important this and other mustards are to the world economy – and to your dinner table.

Read more

Photo of black mustard plant growing in cracked pavement

Black Mustard

A native of Eurasia, black mustard is weedy and grows in fields, waste places, roadsides, and other disturbed areas. Until it was recently replaced by another species (brown mustard, which also is naturalized in Missouri) black mustard was the chief source of seed used in making table mustard.

Read more

Photo of black mustard plants on the edge of a field

Black Mustard

Black mustard can grow to 5 feet tall. Next time you breeze past weedy black mustard on the highway or spot it in a fallow field, think of how important this and other mustards are to the world economy – and to your dinner table.

Read more

Photo of black mustard flower cluster

Black Mustard (Flowers)

The flowers of black mustard are very small, yellow, and about 3/8 inch wide, with the 4 petals arranged like a cross. It blooms April–November. The fruits are long seedpods (technically, siliques) that form lower on the stalk as new flowers develop higher up.

Read more

Photo of black mustard leaves

Black Mustard (Leaves)

The leaves of black mustard have long petioles and are highly variable, often irregularly lobed to the midrib, generally ovate, some with teeth.

Read more

Photo of Canada thistle flowers

Canada Thistle

Cirsium arvense
Canada thistle is a native to Eurasia and arrived on our continent probably before the Revolutionary War—most likely mixed in agricultural seed. A bad weed of crop fields and rangeland farther north, it causes problems in Missouri, too.

Read more

Photo of Canada thistle flowers

Canada Thistle

Canada thistle is a native to Eurasia and arrived on our continent probably before the Revolutionary War—most likely mixed in agricultural seed. A bad weed of crop fields and rangeland farther north, it causes problems in Missouri, too.

Read more

Photo of common teasel, blooming flowerhead, showing lavender flowers.

Common Teasel (Flowerhead)

Common teasel typically has lavender flowers, though occasionally a rare plant produces white flowers. It has been present in our state since before 1880 and is not as aggressive as cut-leaved teasel.

Read more

Photo of common teasel flowering heads.

Common Teasel (Flowerheads)

“Infestation” is the term for what teasels are doing in Missouri. Learn to identify these thistlelike plants, and help to control the weedy spread of these tough, prickly invaders.

Read more

Photo of common teasel showing opposite, unlobed leaves.

Common Teasel (Leaves)

The stem leaves of common teasel are not lobed, and though they are often fused at the base, they don’t form a cuplike structure around the stem.

Read more