Bloomipedia
Scotch broom (Cytisus scoparius)
Photo: rebecca bachman via iNaturalist · CC0 · resized

Flower profile

Scotch broom

Cytisus scoparius

Introduced in the lower 48

Scotch broom is a flowering plant that USDA PLANTS lists as introduced in the lower 48 states. It's on our flower lists for 2 states, and across the U.S. it's most often seen in bloom in April–June.

27states
2of our state lists
13,347U.S. sightings*

*iNaturalist research-grade observations, as of October 17, 2026.

On our lists for: Oregon, Washington

🚫
Regulated invasive plant in Washington and Oregon. It's on those states' official invasive plant lists (Washington: Class B noxious weed (control required in listed regions); Oregon: "B" noxious weed (sale and transport prohibited)). Please don't plant or share it there. WAC 16-750 OAR 603-052-1200

Quick look

Cytisus scoparius, the common broom or Scotch broom, is a deciduous leguminous shrub native to western and central Europe. In Great Britain and Ireland, the standard name is broom; this name is also used for other members of the Genisteae tribe, such as French broom or Spanish broom; and the term common broom is sometimes used for clarification.

  • It belongs to the Fabaceae family. iNaturalist
  • USDA PLANTS describes it as a shrub with a perennial life cycle. USDA PLANTS
  • USDA PLANTS lists it as introduced in the lower 48 states and records it in 27 states. USDA PLANTS
  • NatureServe lists it as not native to Washington and Oregon. NatureServe
  • In Washington, most iNaturalist sightings of it in flower come in April–June. iNaturalist
  • In Oregon, most iNaturalist sightings of it in flower come in April–June. iNaturalist
  • USDA PLANTS lists its flower color as yellow. USDA PLANTS
  • USDA PLANTS gives its bloom period as spring. USDA PLANTS
  • USDA PLANTS lists a mature height of about 7 ft. USDA PLANTS
  • iNaturalist has 5,542 research-grade sightings of it in Washington, ranking #25 among the 110 flowers on our Washington list. iNaturalist
  • iNaturalist has 5,053 research-grade sightings of it in Oregon, ranking #21 among the 110 flowers on our Oregon list. iNaturalist

State flower gift ideas

This one is a regulated invasive plant, so here are state flower gifts instead.

When does it bloom?

Flowering records by month across the U.S. (iNaturalist research-grade observations marked “Flowering”) (1,923 records)
Bloom time in each of our 2 states
StateTypePeak bloomSightings*
WashingtonIntroducedApril–June5,542
OregonIntroducedApril–June5,053

Conservation status

Federal (U.S. ESA)
Not listed No U.S. Endangered Species Act listing in the USFWS ECOS database. USFWS ECOS
NatureServe global
GNR Not yet ranked worldwide. NatureServe
Washington
No list Washington has no state law listing endangered or threatened plants (the Washington Natural Heritage Program's rare plant list isn't regulatory), so we show NatureServe's Washington ranks instead. NatureServe: SNA, not applicable (usually because it isn't native there) in Washington.
Oregon
Not listed Not on Oregon endangered and threatened plants (OAR 603-073-0070). NatureServe: SNA, not applicable (usually because it isn't native there) in Oregon. OAR 603-073-0070
Rare elsewhere
No other U.S. state ranks it S1, S2, SH or SX.

Checked October 17, 2026. Rankings and lists can change, so follow the links for the latest.

Can you eat it?

For peoplePoisonous to people

NC State Extension lists it as poisonous to humans (severity: high). Poisonous parts: leaves, seeds, stems. Symptoms they list: “HIGHLY TOXIC, MAY BE FATAL IF EATEN! Vomiting, excitement, muscular weakness, convulsions.” NC State Extension

For petsNot well documented

It isn't on the ASPCA plant list, and NC State Extension doesn't flag it for pets.

🌿 Never eat a wild plant unless you're certain of its ID; this isn't medical advice. Worried about a person? Call Poison Control at 1-800-222-1222. Worried about a pet? Call your vet.

Where does it grow?

USDA PLANTS records scotch broom in 27 states plus Washington, D.C.

recorded by USDA PLANTS on our state lists not recorded

See the full list of states

Alabama, Alaska, California, Connecticut, Delaware, Georgia, Hawaii, Idaho, Kentucky, Maine, Maryland, Massachusetts, Michigan, Montana, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oregon, Pennsylvania, South Carolina, Tennessee, Utah, Virginia, Washington, West Virginia; District of Columbia.

Washington counties with USDA records: Adams, Chelan, Clallam, Clark, Cowlitz, Grays Harbor, Island, Jefferson, King, Kitsap, Kittitas, Klickitat, Lewis, Lincoln, Mason, Okanogan, Pacific, Pend Oreille, Pierce, San Juan, Skagit, Skamania, Snohomish, Spokane, Stevens, Thurston, Wahkiakum, Whatcom, Yakima.

Oregon counties with USDA records: Benton, Clackamas, Clatsop, Columbia, Coos, Crook, Curry, Douglas, Hood River, Jackson, Josephine, Lane, Lincoln, Linn, Marion, Multnomah, Polk, Tillamook, Union, Washington, Yamhill.

More Washington flowers

Sources