Indigofera coerulea
Indigofera coerulea
Blue Indigo
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Taxonomy
Family Fabaceae · Genus Indigofera
Common Names
Blue IndigoTrue Indigo
Context
nativeRegion
Widely found in tropical and sub-tropical Africa and Asia.
usdaZones
USDA zones 9–11.
companionPlants
Acacia spp., Cassia spp., Other Fabaceae members
culturalUses
Source of natural blue indigo dye; used in traditional medicine and soil improvement due to nitrogen fixation.
Care
Care Requirements
LightFull sun is preferred, though light shade is tolerated.
WateringModerate; water regularly but allow the soil to dry between waterings. Drought tolerant when established.
SoilWell-draining, sandy or loamy soil; tolerant of poor soils but prefers neutral to slightly acidic pH.
FertilizerGenerally minimal; a balanced fertilizer during early growth can encourage vigor.
HumidityPrefers average humidity levels but is adaptable to drier climates.
TemperatureOptimal in warm climates; sensitive to frost and does best where winter temperatures stay above 5°C (41°F).
Growth & Life Cycle
HabitPerennial shrub or subshrub, sometimes grown as an annual in cooler climates.
Mature SizeTypically 1–2 meters tall and wide.
Growth RateModerate growth rate.
BloomingProduces pink to purple pea-like flowers in late spring to summer.
DormancyMay go semi-dormant or die back in cool, dry, or frosty seasons.
Propagation
MethodsSeed, Semi-hardwood cuttings
DifficultyModerate; seeds benefit from scarification before sowing.
Best SeasonSpring to early summer.
Maintenance & Notes
PruningPrune lightly after flowering to maintain shape and encourage bushiness.
RepottingRepot young plants annually; mature plants as needed, usually every 2–3 years.
Pests & DiseasesGenerally pest and disease resistant; watch for root rot in poorly drained soils.
ToxicityNot known to be toxic to pets or humans.
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