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True Indigo

Indigofera tinctoria

Discontinued

True Indigo (Indigofera tinctoria) is a deciduous shrub historically valued for its use in producing natural indigo dye. In the garden, it is known for its delicate, airy foliage and soft pink to purple pea-like flowers that bloom from late spring into summer, adding a gentle charm to garden borders or cottage-style plantings.


While True Indigo prefers full sun to light shade, it performs best in neutral to slightly acidic soils with good drainage. It struggles with alkaline soils and is not highly drought-tolerant, making it a less suitable choice for most of Central Texas, where alkaline soils, intense summer heat, and prolonged droughts are common. True Indigo may survive with significant soil amendments and supplemental irrigation but will generally require more care than other heat-adapted plants.


In garden settings, True Indigo can reach 3-6 feet tall and 3-4 feet wide, often taking a rounded and open form. If planted in Central Texas, it should be located in areas with amended soil and consistent moisture to avoid stress. Spacing plants 3-4 feet apart will allow enough room for its natural form to develop.


In USDA Zones 8-11, True Indigo may overwinter successfully if protected from extreme cold. However, even in milder winters, it may experience dieback and require cutback in early spring to promote healthy regrowth.

Sensitive to Alkaline Areas
Requires Moist Soil
Requires Good Drainage
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Characteristics & Attributes