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Azure Bluet

Houstonia caerulea

Found in forests, woodlands, openings, lawns, a wide variety of disturbed sites. FloraQuest, phone app (app page) What its natural habitat tells you

35
Good

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

Profile 88%

Height
3–6 inches
Spread
3–6 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
Leaves
Deciduous
Fruiting season
May to August

Not yet recorded · Bloom

Bloom: recorded only in the FloraQuest: Carolinas, Georgia (Southeastern Flora Team) phone app (app page).

Recorded in 98 Virginia counties.

Natural habitats

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

1 of 2

Forests and woodlands

Forest or woodland where the source does not say how moist or dry.

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 VA

Genus host records with ranges including VA · 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, yellow or white
Fruit begins
May
Fruit ends
August

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

Growing sources and scope
Also known as

Quaker Ladies

Conservation status

Virginia rankS5
Global rankG5
VA statusNot verified
Federal statusNot verified

Conservation source Global and federal source

In your garden

Will it fit your yard?

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How to check your spot

Sources