Flower profile

Twinberry honeysuckle

Lonicera involucrata

Native in the lower 48

Twinberry honeysuckle is a flowering plant that USDA PLANTS lists as native in the lower 48 states. It's on our flower lists for 6 states, and across the U.S. it's most often seen in bloom in March–July.

14states

6of our state lists

21,710U.S. sightings*

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

On our lists for: Colorado, Montana, Oregon, Utah, Washington, Wyoming

Quick look

Lonicera involucrata, the bearberry honeysuckle, bracted honeysuckle, twinberry honeysuckle, Californian Honeysuckle, twin-berry, or black twinberry, is a species of honeysuckle native to northern and western North America.
From Wikipedia's article Lonicera involucrata, CC BY-SA 4.0.

It belongs to the Caprifoliaceae family. ^iNaturalist
USDA PLANTS describes it as a shrub with a perennial life cycle. ^{USDA PLANTS}
USDA PLANTS lists it as native in the lower 48 states and records it in 14 states. ^{USDA PLANTS}
NatureServe lists it as native to Washington, Oregon, Colorado, Wyoming, Utah and Montana. ^NatureServe
In Washington, most iNaturalist sightings of it in flower come in April–July. ^iNaturalist
In Oregon, most iNaturalist sightings of it in flower come in April–July. ^iNaturalist
USDA PLANTS lists its flower color as yellow. ^{USDA PLANTS}
USDA PLANTS gives its bloom period as summer. ^{USDA PLANTS}
USDA PLANTS lists a mature height of about 10 ft. ^{USDA PLANTS}
iNaturalist has 3,622 research-grade sightings of it in Washington, ranking #46 among the 110 flowers on our Washington list. ^iNaturalist
iNaturalist has 3,597 research-grade sightings of it in Oregon, ranking #41 among the 110 flowers on our Oregon list. ^iNaturalist
iNaturalist has 3,313 research-grade sightings of it in Colorado, ranking #40 among the 110 flowers on our Colorado list. ^iNaturalist

Twinberry honeysuckle gift ideas

Handmade twinberry honeysuckle gifts from independent makers.

🌱 Sample spot. Handmade gift picks from independent shops will appear here once our shop partnership is approved. These cards are placeholders, not real products.

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Twinberry honeysuckle art print
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Twinberry honeysuckle greeting card
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Twinberry honeysuckle mug
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When does it bloom?

Flowering records by month across the U.S. (iNaturalist research-grade observations marked “Flowering”) (2,184 records)

Bloom time in each of our 6 states

State	Type	Peak bloom	Sightings*
Washington	Native	April–July	3,622
Oregon	Native	April–July	3,597
Colorado	Native	June–August	3,313
Wyoming	Native	June–July	657
Utah	Native	May–August	642
Montana	Native	June–July	526

Conservation status

Federal (U.S. ESA): Not listed No U.S. Endangered Species Act listing in the USFWS ECOS database. ^{USFWS ECOS}
NatureServe global: G5 Secure 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: SNR, not yet ranked in Washington.
Oregon: Not listed Not on Oregon endangered and threatened plants (OAR 603-073-0070). NatureServe: SNR, not yet ranked in Oregon. ^{OAR 603-073-0070}
Colorado: No list Colorado has no state law listing endangered or threatened plants, so we show NatureServe's Colorado ranks instead. NatureServe: SNR, not yet ranked in Colorado.
Wyoming: No list Wyoming has no state law listing endangered or threatened plants, so we show NatureServe's Wyoming ranks instead. NatureServe: S4, apparently secure in Wyoming.
Utah: No list Utah has no state law listing endangered or threatened plants, so we show NatureServe's Utah ranks instead. NatureServe: SNR, not yet ranked in Utah.
Montana: No list Montana has no state law listing endangered or threatened plants, so we show NatureServe's Montana ranks instead. NatureServe: SNR, not yet ranked in Montana.
Rare elsewhere: Other states where NatureServe ranks it rare or missing: WI (S1). (S1 critically imperiled, S2 imperiled, SH possibly extirpated, SX presumed extirpated.)

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

Can you eat it?

For peopleNot well documented

None of the sources we checked (NC State Extension (no page for this plant), USDA PLANTS) say whether it's edible or poisonous for people.

For petsNot well documented

It isn't on the ASPCA plant list.

🌿 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 twinberry honeysuckle in 14 states.

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recorded by USDA PLANTS on our state lists not recorded

See the full list of states

Alaska, Arizona, California, Colorado, Idaho, Michigan, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wisconsin, Wyoming.

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

Oregon counties with USDA records: Baker, Benton, Clackamas, Clatsop, Coos, Crook, Curry, Deschutes, Douglas, Grant, Harney, Hood River, Jackson, Jefferson, Klamath, Lake, Lane, Lincoln, Linn, Marion, Multnomah, Tillamook, Umatilla, Union, Wallowa, Wasco, Washington, Wheeler, Yamhill.

Colorado counties with USDA records: Archuleta, Boulder, Chaffee, Clear Creek, Conejos, Costilla, Delta, Dolores, Douglas, Eagle, El Paso, Garfield, Gilpin, Grand, Gunnison, Hinsdale, Huerfano, Jackson, La Plata, Lake, Larimer, Las Animas, Mesa, Mineral, Moffat, Montezuma, Montrose, Park, Pitkin, Rio Blanco, Rio Grande, Routt, Saguache, San Juan, San Miguel, Summit, Teller.

More Washington flowers

Wild teasel

Dipsacus fullonum

Introduced

🌼 Blooms in WA: July–September

Twinflower

Linnaea borealis

Native

🌼 Blooms in WA: May–August

Orange honeysuckle

Lonicera ciliosa

Native

🌼 Blooms in WA: May–June

Sources

USDA, NRCS. PLANTS Database, profile LOIN5.
iNaturalist, Lonicera involucrata: taxonomy, research-grade observation counts and “Flowering” annotations, retrieved October 17, 2026.
Wikipedia, Lonicera involucrata (lead quoted under CC BY-SA 4.0).
Washington: Washington State noxious weed list (WAC 16-750-005, -011, -015).
Oregon: Oregon endangered and threatened plants (OAR 603-073-0070).
Oregon: Oregon noxious weed quarantine, A and B weeds (OAR 603-052-1200).
Colorado: Colorado noxious weed lists A, B and C (8 CCR 1206-2, eff. May 15, 2025).
Wyoming: Wyoming state designated noxious weeds (W.S. 11-5-102(a)(xi)), as listed by the Wyoming Weed & Pest Council.
Utah: Utah noxious weed list (Utah Admin. Code R68-9-3).
Montana: Montana noxious weed list (Admin. R. Mont. 4.5.206–4.5.210).
USFWS, ECOS species database (ESA listing check), October 17, 2026.
NatureServe Explorer, Lonicera involucrata (global and state ranks).
Edibility and toxicity: no source found (marked "not well documented").
Photo: Erik Schiff via iNaturalist · CC0 · resized.