Bloomipedia
Longleaf phlox (Phlox longifolia)
Photo: Daughter Dad via iNaturalist · CC BY 4.0 · resized

Flower profile

Longleaf phlox

Phlox longifolia

Native in the lower 48

Longleaf phlox is a wildflower that USDA PLANTS lists as native 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 March–June.

11states
2of our state lists
4,941U.S. sightings*

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

On our lists for: Idaho, Utah

Quick look

Phlox longifolia, the longleaf phlox, is a species of flowering plant in the family Polemoniaceae. It is native to British Columbia and the western and west-central United States, but is absent west of the Cascades. A perennial subshrub reaching 15 in (38 cm) but usually shorter, it is typically found in dry, open situations such as slopes, rocky areas, and plains.

  • It belongs to the Polemoniaceae family. iNaturalist
  • USDA PLANTS describes it as an herb (forb) / a subshrub with a perennial life cycle. USDA PLANTS
  • USDA PLANTS lists it as native in the lower 48 states and records it in 11 states. USDA PLANTS
  • NatureServe lists it as native to Utah and Idaho. NatureServe
  • In Utah, most iNaturalist sightings of it in flower come in March–June. iNaturalist
  • In Idaho, most iNaturalist sightings of it in flower come in March–June. 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 1.2 ft. USDA PLANTS
  • iNaturalist has 1,622 research-grade sightings of it in Utah, ranking #23 among the 109 flowers on our Utah list. iNaturalist
  • iNaturalist has 843 research-grade sightings of it in Idaho, ranking #28 among the 109 flowers on our Idaho list. iNaturalist

Longleaf phlox gift ideas

Handmade longleaf phlox gifts from independent makers.

When does it bloom?

Flowering records by month across the U.S. (iNaturalist research-grade observations marked “Flowering”) (673 records)
Bloom time in each of our 2 states
StateTypePeak bloomSightings*
UtahNativeMarch–June1,622
IdahoNativeMarch–June843

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
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.
Idaho
No list Idaho has no state law listing endangered or threatened plants, so we show NatureServe's Idaho ranks instead. NatureServe: SNR, not yet ranked in Idaho.
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 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. For context only: ASPCA lists a related species, Phlox subulata (“Moss Phlox”), as non-toxic to dogs and cats. That doesn't tell us about this species, so keep pets away to be safe. 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 longleaf phlox in 11 states.

recorded by USDA PLANTS on our state lists not recorded

See the full list of states

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

Utah counties with USDA records: Beaver, Box Elder, Cache, Carbon, Daggett, Davis, Duchesne, Emery, Garfield, Grand, Iron, Juab, Kane, Millard, Morgan, Piute, Rich, Salt Lake, San Juan, Sanpete, Sevier, Summit, Tooele, Uintah, Utah, Wasatch, Washington, Wayne, Weber.

Idaho counties with USDA records: Ada, Adams, Bannock, Bingham, Blaine, Boise, Bonneville, Butte, Caribou, Cassia, Clark, Custer, Elmore, Franklin, Fremont, Gem, Gooding, Idaho, Kootenai, Latah, Lemhi, Lincoln, Minidoka, Nez Perce, Oneida, Owyhee, Power, Twin Falls, Washington.

More Utah flowers

Sources