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Home / Weed & Pest Directory / Species / Brooms & Gorse

Brooms & Gorse

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French Broom. Photo Credit: John M. Randall, The Nature Conservancy, Bugwood.org
  • French broom.
    French Broom. Photo Credit: John M. Randall, The Nature Conservancy, Bugwood.org
  • Scotch broom infestation.
  • Close up of Scotch broom's yellow flowers.
    Scotch Broom. Photo Credit: Martin LaBar, Flickr
  • Scotch broom seedpod. Photo Credit: Martin LaBar, Flickr
  • Close up of yellow flowers and green leaves of French broom.
    French broom. Photo Credit: Jill Motts, Flickr
  • Close up of gorse's yellow flowers.
    Gorse flowers. Photo Credit: Forest and Kim Starr, Starr Environmental, Bugwood.org
  • Gorse.
  • Gorse infestation.

Species include:

  • Scotch Broom (Cytisus scorparius) also called Scot’s, English, European or common broom
  • Portuguese broom (Cytisus striatus) also called striated broom
  • Spanish broom (Spartium junceum) also called weaver’s broom
  • French broom (Genista monspessulana) also called canary broom
  • Gorse (Ulex europaeus) also called European gorse

Broom species and gorse are often classified together because of the similar appearance and impact on landscapes. These tall, perennial species were originally introduced to our region as ornamentals, but quickly escaped into natural areas. Growing in dense stands, these species displace native and desirable plants and pose a significant fire hazard.

Description:

Life Cycle:Perennial (life cycle lasts more than one year)
Early Detection and Rapid Response species:No
Height:Up to 10 feet (3 meters)
Leaf Description:Each species has woody, green stems and dark green leaves that look like brooms.
Fruit & Flower Description:Each species has bright yellow, pealike flowers that produce tiny seed pods after they have bloomed, typically June to July. These species’ produce thousands of seeds each year that can remain viable in soil for up to 30 years.
Bloom Time:April to June

Habitat:

  • Brooms and gorse can be found in open areas that have recently been disturbed including, grasslands, pastures, roadsides, and recently harvested woodlands.
  • They all grow best in sunny areas with well-drained soils.

Impact:

  • Broom species and gorse not only look similar, but they have similar impacts on the watershed. They grow in dense stands that easily outcompete native vegetation for space and nutrients. This results in the loss of grasslands and prevents reforestation by crowding out conifer seedlings.
  • Scotch broom seeds are also toxic to some livestock.
  • These species pose a serious fire hazard to landscapes. Dense stands create ladder fuelsFuels can include anything from living and dead trees, shrubs, grassy fields, and human-built structures. that allow wildfire to spread into tree canopy layers. Gorse produces highly flammable oils in its stems which pose an extreme fire hazard.

What you can do about it:

  • Manual treatment, such as hand pulling or digging up the plant, are options for small infestations. The best time for this 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 brooms and gorse. If you are in Washington County, we lend these tools for free from our tool library.

Look Alikes:

Brooms and gorse 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:

  • Pacific Northwest Weed Management Handbook: Brooms and gorse

Scotch Broom

  • Oregon Department of Agriculture: Scotch broom
  • Washington State Noxious Weed Control Board: Scotch broom
  • 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

Gorse

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

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

Posted In:

AgriculturalCommonForestPlantToxic
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