Flower profile
Grand collomia
Collomia grandiflora
Grand collomia is a wildflower that USDA PLANTS lists as native in the lower 48 states. In Oregon it's most often seen in bloom in May–July.
*iNaturalist research-grade observations, as of October 17, 2026.
On our lists for: Oregon
Quick look
Collomia grandiflora is a western North American annual plant in the phlox family (Polemoniaceae), known by the common names grand collomia, large-flowered mountain trumpet, and large-flowered collomia. It usually appears in sandy habitats and is cultivated as an ornamental.
- It belongs to the Polemoniaceae family. iNaturalist
- USDA PLANTS describes it as an herb (forb) with a annual life cycle. USDA PLANTS
- USDA PLANTS lists it as native in the lower 48 states and records it in 10 states. USDA PLANTS
- NatureServe lists it as native to Oregon. NatureServe
- In Oregon, most iNaturalist sightings of it in flower come in May–July. iNaturalist
- iNaturalist has 1,762 research-grade sightings of it in Oregon, ranking #100 among the 110 flowers on our Oregon list. iNaturalist
Grand collomia gift ideas
Handmade grand collomia 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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Grand collomia art print
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Grand collomia greeting card
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Grand collomia mug
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Grand collomia earrings
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Grand collomia embroidery pattern
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Grand collomia sticker
When does it bloom?
In Oregon, most flowering sightings come in May–July.
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
- 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
- Rare elsewhere
- Other states where NatureServe ranks it rare or missing: CO (S2), WY (SH). (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?
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.
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 grand collomia in 10 states.
recorded by USDA PLANTS on our state lists not recorded
See the full list of states
Arizona, California, Colorado, Idaho, Montana, Nevada, Oregon, Utah, Washington, Wyoming.
Oregon counties with USDA records: Baker, Benton, Clackamas, Crook, Curry, Deschutes, Douglas, Grant, Harney, Hood River, Jackson, Jefferson, Josephine, Klamath, Lake, Lane, Lincoln, Linn, Malheur, Marion, Morrow, Multnomah, Polk, Sherman, Umatilla, Union, Wallowa, Wasco, Wheeler, Yamhill.
More Oregon flowers
Sources
- USDA, NRCS. PLANTS Database, profile COGR4.
- iNaturalist, Collomia grandiflora: taxonomy, research-grade observation counts and “Flowering” annotations, retrieved October 17, 2026.
- Wikipedia, Collomia grandiflora (lead quoted under CC BY-SA 4.0).
- Oregon: Oregon endangered and threatened plants (OAR 603-073-0070).
- Oregon: Oregon noxious weed quarantine, A and B weeds (OAR 603-052-1200).
- USFWS, ECOS species database (ESA listing check), October 17, 2026.
- NatureServe Explorer, Collomia grandiflora (global and state ranks).
- Edibility and toxicity: no source found (marked "not well documented").
- Photo: jonsense via iNaturalist · CC BY 4.0 · resized.