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10 Μαρ 2023 · Technically, “indigo plants” could refer to any of the 750-plus species of trees, shrubs, herbaceous perennials, or annuals within the Indigofera genus. Here, we’ll cover a handful of popular species that can be grown in the US: I. amblyantha, I. decora, I. heterantha, and I. kirilowii.
Genus: Indigofera. Species: heterantha. Skill Level: Experienced. Exposure: Full sun. Hardiness: Hardy. Soil type: Well-drained/light. Height: 180cm. Spread: 180cm. Time to plant seeds:...
Himalayan indigo. A medium-sized deciduous shrub, herbaceous in colder areas and then making up to 1.2m annual growth. Leaves pinnate with 13-21 small leaflets. Flowers 12mm, rosy-purple, in racemes to 12cm in length from early summer.
Indigofera heterantha flowering on the south-facing terrace at Knightshayes Court, Devon, UK (September 2022). Image Jack Aldridge. A deciduous shrub with downy, slightly-ribbed branches.
It is a charming dwarf shrub, flowering freely in July and August, its shoots being mostly cut back to the ground in winter. It is not adapted for rough treatment, and should be given a front place in the shrubbery, or even a place in the rock garden.
Indigo, (genus Indigofera), large genus of more than 750 species of shrubs, trees, and herbs in the pea family (Fabaceae). Some species, particularly true indigo (Indigofera tinctoria) and Natal indigo (I. arrecta), were once an important source of indigo dye.
Indigofera tinctoria, commonly called true indigo, is a deciduous spreading tropical shrub or subshrub of the pea family that typically grows to 2-3’ tall and as wide. As suggested by the common name, this shrub was the original source of the blue dye known as indigo.
