Kochia

Kochia scoparia

Kochia

Family: Chenopodiaceae

Other Common Names: burning bush, Mexican firebrush, mock cypress
Weed class: B
Year Listed: 1988
Native to: Europe and Asia
Is this Weed Toxic?:

livestock


Legal listings:

WA Quarantine list, WAC 16-750

Why Is It a Noxious Weed?

In areas where kochia is widespread, it is considered a serious pest of late-maturing crops. Kochia is an effective competitor for light, nutrients, and soil moisture, and can reduce crop yield.

How would I identify it?

General Description

Kochia is an annual herbaceous plant that has a deep taproot and grows 1.6 to 4.9 feet tall. Kochia stems are upright and spreading with many branches.

Flower Description

Flowers are small and green, grouped in clusters in the upper leaf axils and on terminal spikes.

Leaf description

Kochia leaves are alternately arranged and are 1 to 2 inches long. They are narrow to lance shaped with smooth, hairy edges and may have silky hairs on leaf undersides.

Stem description

Stems are upright, branched and have hairs on the upper parts of stems, sometimes tinged red.

Fruit Seed Description

Each flower forms a small inflated seed bearing structure that is covered by the sepals. Seeds are wedge-shaped and light brown.

Where does it grow?

Kochia is found on pasture, rangeland, roadsides, ditch banks, wastelands and cultivated fields. Please click here to see a county level distribution map of kochia in Washington.

How Does it Reproduce?

Kochia reproduces from seeds, it typically produces around 14,600 seeds per plant. Seeds are dispersed in the fall when the plant becomes a tumbleweed.

How Do I Control It?

Mechanical Control

Mowing or slashing the plants before flowering is effective in reducing seed production.

Cultural Control

Early tillage in the spring gives good control of the Kochia seedlings.

Herbicide Control

Please refer to the PNW Weed Management Handbook, or contact your county noxious weed coordinator.

For More Information

See our Written Findings for more information about kochia (Kochia scoparia).

Report on kochia from the book "Weed Control in Natural Areas in the Western United States"

Franklin County NWCB Fact Sheet on kochia

Stevens County NWCB Fact Sheet on kochia

Control Options for kochia from Lincoln County NWCB

Additional Photos