North America Native Plant

Greenman’s Bluet

Botanical name: Houstonia parviflora

USDA symbol: HOPA3

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Hedyotis greenmanii Fosberg (HEGR11)   

Greenman’s Bluet: A Tiny Texas Treasure for Your Native Garden Meet Greenman’s bluet (Houstonia parviflora), a charming little annual that’s proving that good things really do come in small packages. This delicate native wildflower might not be the showiest plant in your garden, but it’s got a special place in ...

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 ⚘ Critically Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) ⚘

Region: Arkansas

Greenman’s Bluet: A Tiny Texas Treasure for Your Native Garden

Meet Greenman’s bluet (Houstonia parviflora), a charming little annual that’s proving that good things really do come in small packages. This delicate native wildflower might not be the showiest plant in your garden, but it’s got a special place in the hearts of native plant enthusiasts—and for good reason!

What Makes Greenman’s Bluet Special?

This petite forb is a true Texan, native to the Lone Star State with some populations extending into Arkansas. As an annual herb, Greenman’s bluet completes its entire life cycle in just one growing season, producing tiny four-petaled flowers that range from pale blue to white. Don’t let its small stature fool you—this little plant packs a punch when it comes to supporting local ecosystems.

Where Does It Call Home?

Greenman’s bluet has a fairly limited native range, primarily found in Texas. This makes it a true regional specialty that adds authentic local character to native plant gardens in its home territory.

A Plant Worth Protecting

Important conservation note: Greenman’s bluet is considered vulnerable, with a global conservation status of S3. In Arkansas, it’s even rarer with an S1 status. If you’re interested in growing this special plant, please ensure you source seeds or plants from reputable native plant nurseries that practice responsible collection methods. Never collect from wild populations.

Garden Design and Landscaping Role

This charming annual works beautifully in:

  • Native wildflower meadows
  • Naturalized garden areas
  • Understory plantings beneath taller natives
  • Rock gardens with native themes
  • Conservation-focused landscapes

While it may not be the star of your garden show, Greenman’s bluet serves as wonderful supporting cast, filling in gaps and adding delicate texture to native plant communities.

Growing Conditions and Care

Greenman’s bluet is surprisingly adaptable for such a rare plant. Here’s what it needs to thrive:

  • Sunlight: Partial shade to full sun
  • Soil: Prefers sandy or rocky, well-draining soils
  • USDA Hardiness Zones: 7-9
  • Water needs: Moderate; avoid overwatering

Planting and Care Tips

The beauty of working with Greenman’s bluet lies in its low-maintenance nature:

  • As a self-seeding annual, it will return year after year if conditions are right
  • Plant seeds in fall or early spring
  • Minimal care required once established
  • Allow plants to set seed before cleaning up garden beds
  • Avoid heavy fertilization—this plant prefers lean soils

Supporting Pollinators and Wildlife

Though small, Greenman’s bluet punches above its weight when it comes to supporting local wildlife. Its tiny flowers attract small native bees, flies, and other beneficial insects that are often overlooked but crucial to healthy ecosystems. As an annual that readily self-seeds, it provides consistent blooms throughout its growing season.

Should You Plant Greenman’s Bluet?

If you’re gardening within its native range and are passionate about supporting rare native plants, Greenman’s bluet could be a meaningful addition to your landscape. However, given its vulnerable status, this isn’t a plant for casual gardeners. Consider it if you:

  • Are committed to supporting native plant conservation
  • Have experience growing native wildflowers
  • Can source plants or seeds responsibly
  • Want to create habitat for small native pollinators
  • Appreciate subtle, delicate beauty in the garden

Remember, growing rare native plants comes with responsibility. By choosing Greenman’s bluet, you’re not just adding a pretty flower to your garden—you’re participating in the conservation of a vulnerable species and supporting the intricate web of life that depends on native plants.

Greenman’s 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 parviflora Holz. ex Greenm. - Greenman's bluet

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