Bloomipedia
Broad-leaved sweet pea (Lathyrus latifolius)
Photo: Eric Johnson via iNaturalist · CC BY 4.0 · resized

Flower profile

Broad-leaved sweet pea

Lathyrus latifolius

Introduced in the lower 48

Broad-leaved sweet pea is a wildflower that USDA PLANTS lists as introduced in the lower 48 states. It's on our flower lists for 3 states, and across the U.S. it's most often seen in bloom in May–September.

47states
3of our state lists
28,220U.S. sightings*

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

On our lists for: Michigan, Oregon, Washington

🚫
Regulated invasive plant in Oregon. It's on that state' official invasive plant list (Oregon: "B" noxious weed (sale and transport prohibited)). Please don't plant or share it there. OAR 603-052-1200

Quick look

Lathyrus latifolius, the perennial peavine, perennial pea, broad-leaved everlasting-pea, or just everlasting pea, is a robust, sprawling herbaceous perennial flowering plant in the pea family Fabaceae. It is native to Europe but is present on other continents, such as North America and Australia, where it is most often seen along roadsides.

  • It belongs to the Fabaceae family. iNaturalist
  • USDA PLANTS describes it as an herb (forb) / a vine with a perennial life cycle. USDA PLANTS
  • USDA PLANTS lists it as introduced in the lower 48 states and records it in 47 states. USDA PLANTS
  • NatureServe lists it as not native to Oregon, Washington and Michigan. NatureServe
  • In Oregon, most iNaturalist sightings of it in flower come in June–September. iNaturalist
  • In Washington, most iNaturalist sightings of it in flower come in June–September. iNaturalist
  • USDA PLANTS lists its flower color as purple. USDA PLANTS
  • USDA PLANTS gives its bloom period as late spring. USDA PLANTS
  • USDA PLANTS lists a mature height of about 2 ft. USDA PLANTS
  • iNaturalist has 3,163 research-grade sightings of it in Oregon, ranking #47 among the 110 flowers on our Oregon list. iNaturalist
  • iNaturalist has 2,866 research-grade sightings of it in Washington, ranking #62 among the 110 flowers on our Washington list. iNaturalist
  • iNaturalist has 2,009 research-grade sightings of it in Michigan, ranking #81 among the 111 flowers on our Michigan 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”) (2,257 records)
Bloom time in each of our 3 states
StateTypePeak bloomSightings*
OregonIntroducedJune–September3,163
WashingtonIntroducedJune–September2,866
MichiganIntroducedJune–September2,009

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
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
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.
Michigan
Not listed Not on Michigan endangered and threatened plants (Mich. Admin. Code R 299.1028, eff. March 20, 2023). NatureServe: SNA, not applicable (usually because it isn't native there) in Michigan. R 299.1028
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: low). Poisonous parts: seeds. Symptoms they list: “TOXIC ONLY IF LARGE QUANTITIES EATEN. "Lathyrism": paralysis, slow and weak pulse, shallow breathing, and convulsions, tremors, seizures and possibly death.” NC State Extension

For petsToxic to horses (not dogs or cats)

ASPCA's entry “Sweet Pea” (Lathyrus latifolius) lists it as toxic to horses, but non-toxic to dogs and cats. Signs include: Weakness, lethargy, pacing, head pressing, tremors, seizures and possibly… ASPCA

🌿 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 broad-leaved sweet pea in 47 states plus Washington, D.C.

recorded by USDA PLANTS on our state lists not recorded

See the full list of states

Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming; District of Columbia.

Oregon counties with USDA records: Benton, Clackamas, Coos, Curry, Douglas, Hood River, Jackson, Josephine, Klamath, Lane, Lincoln, Marion, Multnomah, Polk, Tillamook, Umatilla, Wasco.

Washington counties with USDA records: Chelan, Clark, Columbia, Cowlitz, Island, King, Klickitat, Lewis, Lincoln, Pacific, Pierce, San Juan, Skagit, Stevens, Thurston, Wahkiakum, Whatcom, Whitman.

Michigan counties with USDA records: Alcona, Alpena, Antrim, Benzie, Berrien, Calhoun, Cass, Charlevoix, Cheboygan, Clinton, Emmet, Genesee, Houghton, Isabella, Kalamazoo, Kalkaska, Kent, Keweenaw, Leelanau, Livingston, Mackinac, Marquette, Monroe, Montmorency, Newaygo, Oakland, Oceana, Otsego, Van Buren, Washtenaw.

More Oregon flowers

Sources