North America Native Plant

Ouachita Bluet

Botanical name: Houstonia ouachitana

USDA symbol: HOOU

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Hedyotis ouachitana E.B. Sm. (HEOU)   

Ouachita Bluet: A Rare Native Gem Worth Protecting in Your Garden Meet the Ouachita bluet (Houstonia ouachitana), a charming little native wildflower that’s as rare as it is beautiful. This delicate perennial is one of those special plants that makes you feel like you’re part of something bigger when you ...

Rare plant alert!

Region: Arkansas

Status: S3: Status is uncertain but is somewhere between the following rankings: Vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals ⚘ Vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals ⚘

Region: Arkansas

Ouachita Bluet: A Rare Native Gem Worth Protecting in Your Garden

Meet the Ouachita bluet (Houstonia ouachitana), a charming little native wildflower that’s as rare as it is beautiful. This delicate perennial is one of those special plants that makes you feel like you’re part of something bigger when you grow it – because you literally are helping to conserve a vulnerable species!

What Makes Ouachita Bluet Special

The Ouachita bluet is a native forb (that’s just a fancy way of saying a non-woody flowering plant) that belongs exclusively to the lower 48 states. More specifically, this little beauty calls the Ouachita Mountains region home, growing naturally only in Arkansas and Oklahoma. It’s what botanists call an endemic species – meaning it exists nowhere else on Earth.

As a perennial, this plant comes back year after year, forming low-growing mats that produce clusters of tiny, four-petaled flowers ranging from white to pale blue. The blooms may be small, but they pack a punch when it comes to charm and ecological value.

A Plant That Needs Our Help

Here’s where things get serious for a moment. The Ouachita bluet has a Global Conservation Status of S3, which means it’s considered vulnerable. With typically only 21 to 100 occurrences and between 3,000 to 10,000 individuals in the wild, this species is walking a tightrope toward potential extinction.

If you’re thinking about adding this rare beauty to your garden, that’s wonderful – but please make sure you source it responsibly. Never collect plants from the wild, and only purchase from reputable native plant nurseries that propagate their stock rather than wild-harvesting it.

Where Ouachita Bluet Shines in Your Landscape

This little gem is perfect for:

  • Native plant gardens focused on regional species
  • Rock gardens where its mat-forming habit can cascade over stones
  • Naturalized woodland edges
  • Conservation-minded landscapes

The Ouachita bluet works beautifully as a ground cover, filling in spaces between larger plants and creating delicate carpets of blooms during its flowering season.

Growing Conditions and Care

Like many plants from the Ouachita Mountains, this species appreciates well-drained, acidic soils. It thrives in USDA hardiness zones 6-8, making it suitable for much of the central and southern United States.

For best results, provide:

  • Well-draining, sandy or rocky soil
  • Acidic soil conditions
  • Partial shade to full sun
  • Minimal fertilization (too much can actually harm native plants)

Planting and Care Tips

The key to success with Ouachita bluet is remembering that less is often more with native plants. These resilient little plants have evolved to thrive without human intervention, so the best care is often the most hands-off approach.

Plant in spring after the last frost, ensuring excellent drainage to prevent root rot. Water regularly the first season to help establish roots, then allow the plant to follow its natural cycles, including winter dormancy.

Supporting Pollinators and Wildlife

While small in stature, Ouachita bluet punches above its weight when it comes to supporting local ecosystems. The tiny flowers attract small native bees, flies, and other diminutive pollinators that often get overlooked by larger blooms. By growing this plant, you’re providing crucial habitat for these important but often forgotten creatures.

The Bottom Line

Growing Ouachita bluet is more than just adding another pretty plant to your garden – it’s participating in conservation. This vulnerable species needs gardeners like you to help ensure its survival for future generations. Just remember to source responsibly, and you’ll be rewarded with a unique, beautiful, and ecologically valuable addition to your native plant collection.

Sometimes the smallest plants make the biggest difference, and the Ouachita bluet is living proof of that truth.

Ouachita Bluet

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Rubiales

Family

Rubiaceae Juss. - Madder family

Genus

Houstonia L. - bluet

Species

Houstonia ouachitana (E.B. Sm.) Terrell - Ouachita bluet

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA