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Summer Bluet

Houstonia purpurea

Found in moist and dry woodlands and forests, thinner soils around rock outcrops, and in a variety of disturbed sites, such as paths, old roads, and roadbanks. FloraQuest, phone app (app page) What its natural habitat tells you

35
Good

Native to Florida. How scores work Is it native here?

Profile 100%

Height
6–8 inches
Spread
4–12 inches
Light
Dappled sunlight, Full sun, Partial shade
Soil moisture
Somewhat dry to moist

Space about 1 ft apart from its recorded spread, about 100 per 100 sq ft. Enter your bed size for a count

Will it fit your yard?

At a glance

Life cycle
Perennial
Bloom
May to July
Fruiting season
July to August

Not yet recorded · Leaves

Recorded in 2 Florida counties.

Natural habitats

Places it grows wild. Not a planting requirement. Each habitat page lists the plants and wildlife also found there.

1 of 4

Forests and woodlands

Trail on Little Kennesaw Mountain.
Named place / source context. Shown: Kennesaw Mountain National Battlefield Park, Georgia, a neighboring state.Trail on Little Kennesaw Mountain., Unidentified in HFC record, undated. Public domain. Source record.

Cliffs, ledges and rocky summits

Trees and rocks on Little Kennesaw Mountain.
Named place / source context. Shown: Kennesaw Mountain National Battlefield Park, Georgia, a neighboring state.Trees and rocks on Little Kennesaw Mountain., Unidentified in HFC record, undated. Public domain. Source record.

Dry forests and woodlands

Forests and open woodlands on dry ridges and slopes, often oak or pine.

Roadsides, fields and disturbed ground

Ground opened by people: roadsides, old fields, pastures, fencerows and lots.

All habitats

Ecological relationships

Who uses this plant?

What these records mean

1CaterpillarsGenus host records with ranges including FL

Genus host records with ranges including FL · Houstonia

  • Thyris maculataSpotted Thyris
Shropshire & Tallamy 2025, Lepidoptera of North America north of Mexico, ZooKeys 1261 (ODbL)
13BeesSoutheastern regional records

Southeastern regional records · Houstonia

Individual names are not available yet.

Noori, Seltmann & Orr 2026, A curated and integrated dataset for exploring global bee-plant interactions (GloBI), Zenodo, CC BY 4.0
1Specialist beesPollen specialists

Pollen specialists · Houstonia

  • Perdita pedernalensis
Smith, Bachelder, Russell, Morales, Mosher & Seltmann 2024, Bee-Specialization-Modeling v0.6.1 (specialist host table compiled from J. Fowler's pollen specialist bee lists), Zenodo, CC BY 4.0
—BirdsRecorded genus food-resource interactions; not a state feeding claim

No records yet · Ants · Beetles · Flies · Adult butterflies / moths · Other wasps · Other insects

Growing and identification

Plant details

Family
Rubiaceae
Hardiness
Zones 3a–8b
Soil pH
Acidic to neutral
Flower color
Blue, pink, purple or white
Fruit begins
July
Fruit ends
August

Safety has not been reviewed for this plant; check toxicity and thorns before planting.

Growing sources and scope
  • Bloom · “May to July” · FloraQuest: Carolinas, Georgia (Southeastern Flora Team), phone app (app page) · Carolinas and Georgia
  • Flower color · “Blue, pink, purple or white” · NC Extension Plant Toolbox (ranked first; Lady Bird Johnson Wildflower Center differs)
  • Fruit begins · “July” · FloraQuest: Carolinas, Georgia (Southeastern Flora Team), phone app (app page) · Carolinas and Georgia
  • Fruit ends · “August” · FloraQuest: Carolinas, Georgia (Southeastern Flora Team), phone app (app page) · Carolinas and Georgia
  • Hardiness · “Zones 3a–8b” · NC Extension Plant Toolbox
  • Height · “6–8 inches” · NC Extension Plant Toolbox (ranked first; Lady Bird Johnson Wildflower Center differs)
  • Life cycle · “Perennial” · NC Extension Plant Toolbox
  • Light · “Dappled sunlight (shade through upper canopy all day); Full sun (6 or more hours of direct sunlight a day); Partial shade (direct sunlight only part of the day, 2-6 hours)” · NC Extension Plant Toolbox
  • Soil · “Moist; Occasionally dry” · NC Extension Plant Toolbox
  • Soil pH · “Acidic to neutral” · NC Extension Plant Toolbox
  • Spread · “4–12 inches” · NC Extension Plant Toolbox
Also known as

Mountain Bluets; Summer Bluets; Venus Pride

Conservation status

Florida rankSNR
Global rankG5
FL statusNot verified
Federal statusNot verified

Conservation source Global and federal source

In your garden

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Sources