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Home / Weed & Pest Directory / Species / Common Broom (Cytisus scorparius)

Common Broom (Cytisus scorparius)

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Common broom flowers.
  • Common broom flowers
    Common broom flowers.
  • Yellow common broom flowers and green seed pod.
    Common broom. Photo Credit: Eric Coombs, ODA, Bugwood.org
  • Common broom seedpod
    Common broom seedpod. Photo Credit: Martin LaBar, Flickr
  • Common broom infestation.
    Common broom infestation.

Also known as: Scotch broom, Scot’s broom.

Chances are you’ve seen common broom. Its bright yellow flowers stand out along roads and highways throughout the Tualatin River watershed.  While its flowers bring a splash of color to the landscape, its dense growth displaces native plants and desirable crops. It also creates ladder fuels in forested areas.

Description:

Life Cycle:Perennial (life cycle lasts more than one year)
Early Detection and Rapid Response species:No
Height:Up to 12 feet (4 meters) tall
Leaf Description:Common broom has dark green leaves composed of three oblong leaflets. Its leaves often fall during the summer in periods of drought, leaving bare green
Fruit & Flower Description:It produces a mass of bright yellow, pea-like flowers. Each flower has five petals.

It produces thousands of tiny seed pods once they have bloomed. Their seeds can remain viable in the soil for up to 80 years.
Bloom Time:March to June

Habitat:

  • Common broom grows best in open sunny areas with well-drained soils.
  • It can be found along roadsides, pastures, grasslands, and areas that recently experienced soil disturbance.

Impact:

  • Common broom grows in dense stands that outcompete native plants and crops for space and nutrients. This results in the loss of grasslands and prevents reforestation by crowding out conifer seedlings.
  • It poses a serious fire hazard. Dense stands create ladder fuels that allow wildfire to spread into tree canopies.
  • It produces toxins that inhibit neighboring plants from growing.
  • It can cause mild poisoning in livestock such as horses and alpacas when consumed in large amounts.

What you can do about it:

  • Manual treatment, such as hand pulling or digging, are options for small patches. The best time for treatment is in the spring when the ground is damp.
  • Treatment must be repeated for many years because these species produce thousands of long-lived seeds and are able to re-sprout from small stems, stumps, or root crowns.
  • Weed wrenches can assist with removing larger plants. If you are in Washington County, we lend these tools for free from our tool library.
  • Plant material should be burned or disposed of in tied plastic bags in the garbage – not the yard debris or home compost.

Look-alikes:

Bright yellow gorse flowers.
Gorse flowers. Photo Credit: Forest and Kim Starr, Starr Environmental, Bugwood.org

Brooms are often confused with gorse (Ulex europaeus). Unlike broom species, gorse has thorny stems.

Individual brooms species have similar characteristics, but there are slight differences that distinguish each species. Visit the resources below to explore these differences.

Noxious Weed Listing:

State of Oregon:Class B
State of Washington:Class B

More Resources:

Download the Common Broom Best Management Practices Factsheet

Download Factsheet
  • Pacific Northwest Weed Management Handbook: Brooms
  • University of California, Weed Research & Information Center: Scotch broom

Portuguese Broom

  • Oregon Department of Agriculture: Portuguese broom

Spanish Broom

  • Oregon Department of Agriculture: Spanish broom
  • Washington State Noxious Weed Control Board: Spanish broom
  • University of California, Weed Research & Information Center: Spanish broom

French Broom

  • Oregon Department of Agriculture: French broom
  • Washington State Noxious Weed Control Board: French broom
  • University of California, Weed Research & Information Center: French broom

« Reed Canarygrass (Phalaris arundinacea)
Italian Arum (Arum italicum) »

Posted In:

AgriculturalCommonForestPlantToxic
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7175 NE Evergreen Pkwy #400
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