Invasive Species: Scotch Broom

Cytisus scoparius

Scotch broom was widely planted as an ornamental along highway corridors. Now it is endemic to western Oregon and the most extensive forest weed species.

Why is it important to control?

An aggressive pioneer species, scotch broom displaces native plants and can smother tree transplants in forestry sites. It grows fast and sets a lot of seed to expand its area.

Green Scotch broom bushes in a field

How can you identify it?

Close up image of yellow Scotch broom flowerGreen Scotch broom seed pod with yellow flowers around it
Habitat: Open, sunny areas with well-drained soils. Disturbed areas.
Life Cycle: Perennial
Height: Up to 12 feet
Leaf Description: Dark green leaves composed of three oblong leaflets. Green stems and branches.
Fruit & Flower Description: Bright yellow pea-like flowers.
Bloom Time: March to June

How do you control it?

  • Hand-pulling works for small infestations. Pull when soil is moist.

  • Burn plant material or dispose in a tied bag and throw away in trash.

  • Herbicide control:  Oregon State University Extension recommends a triclopyr or glyphosate based herbicide. Take care to avoid drift and be cautious near crops. FOLLOW ALL LABEL DIRECTIONS!

  • The Oregon Department of Agriculture has approved and implemented three biocontrols, a seed weevil, a beetle, and a twig miner. This has had a significant impact on populations, but it needs to be kept in mind that biocontrols are not focused on eradication.

How to report it?

There are various ways you can report this noxious weed.

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