Scarlet Indigo Plant Care

Scarlet Indigo (Indigofera miniata) belongs to the Fabaceae family within the Indigofera genus. Scarlet Indigo is native to the US states of Kansas, Oklahoma, Texas, Alabama, and Florida, and to Mexico, Guatemala, and Cuba. Scarlet Indigo is also known as Red Indigo.

Scarlet Indigo displays an upright, spreading shrub growth habit, reaching up to 4 ft tall with a spread of approximately 6 ft. Scarlet Indigo produces showy clusters of pink, purple, or white pea-like flowers.

Leaf size: approximately 3 inches.

Water a young or newly planted Scarlet Indigo every 7–10 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established shrubs mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.

Scarlet Indigo thrives in full sun to partial shade.

Indigofera miniata tolerates temperatures of 50–85°F. Scarlet Indigo prefers humidity levels of 40–70%.

Well-draining sandy loam with added organic matter. Good drainage is essential for Scarlet Indigo to prevent waterlogging, which leads to root rot and fungal issues.

Feed Scarlet Indigo every 6 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established shrubs in good soil often need little extra feeding, so let weak growth or pale foliage guide you.

Stop feeding by late summer so new growth can harden before winter.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Choose a spot with full sun to partial shade and well-draining sandy loam with added organic matter. Avoid low spots where water collects after rain.

Scarlet Indigo is suited to USDA Zone 12a.

Plant container-grown or balled-and-burlapped shrubs in spring or early autumn, setting the root flare at soil level, and water well after planting.

Scarlet Indigo can spread to about 6 ft (1.8 m) and reach about 4 ft (1 m) tall. Space plants about 6 ft (1.8 m) apart so mature crowns don't crowd each other, and plant at least half that distance from buildings, fences and paths.

Planning a row or hedge? Try the plant spacing calculator.

Prune Scarlet Indigo while it is dormant in late winter: first remove dead, damaged and crossing branches, then thin lightly for shape.

If it flowers in spring, prune right after flowering instead so you don't remove next year's buds. Never take off more than about a quarter of the shrub in one year.

Scarlet Indigo is frost-tender (hardy to USDA zone 12). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.

Scarlet Indigo can be propagated through seeds, softwood cuttings. Similar propagation techniques also apply to indigofera astragalina plant care, which shares the same genus.

See all plants toxic to cats and plants toxic to dogs.

Scarlet Indigo is susceptible to aphids, leafhoppers, spider mites. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

Scarlet Indigo grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Scarlet Indigo is native to the US states of Kansas, Oklahoma, Texas, Alabama, and Florida, and to Mexico, Guatemala, and Cuba. In cooler regions, grow Scarlet Indigo as a houseplant or bring it indoors before the first frost.