Indigo (Indigofera kirilowii) is a deciduous shrub from the Fabaceae family that brings the romance of natural dye plants into the ornamental garden. Growing 2 to 3 feet tall and spreading 24 to 48 inches wide, this suckering shrub produces dense racemes of showy pink, pea-like flowers from June through July, sometimes continuing sporadically into September. Hardy in zones 5 through 7, it tolerates moderate moisture and full sun, and in colder zones can be grown as an herbaceous perennial, cut back to the ground each spring to regenerate fresh growth. The genus itself carries centuries of significance; its name literally means 'indigo-bearing,' referencing the deep blue dye historically extracted from related species.
Full Sun
Moderate
5-7
36in H x 48in W
—
High
Hover over chart points for details
Dense clusters of rose-pink flowers bloom heavily in early summer, creating an airy, romantic effect that distinguishes Indigo from other shrubs in its hardiness range. The plant proves remarkably resilient, tolerating alkaline soils and moderate drought once established, while also bouncing back from harsh winters by regrowing from its base. Its arching, suckering growth habit makes it both a structural garden element and a low-maintenance choice for gardeners willing to let it spread naturally.
Indigo serves primarily as an ornamental shrub, valued for its showy summer flowers and refined garden presence rather than for harvest or production. Its dense, spreading habit makes it useful for creating informal hedging or ground-level structure in mixed borders, while its tolerance for alkaline soils and some drought positions it as a practical choice for challenging sites where many shrubs struggle.
No timeline data available yet for this variety.
In zones 5 and 6A, cut back all stems close to the ground in late winter to early spring before new growth appears, allowing the plant to regenerate as an herbaceous perennial. In warmer zones where the plant persists as a true shrub, prune to maintain shape and control spread, though the plant's natural suckering, arching habit is often best left to develop somewhat naturally. Remove any dead or damaged wood after winter.
Enter your ZIP code to see a personalized growing calendar for this plant.
“Indigofera kirilowii belongs to a genus of over 700 species, the majority of which hail from tropical and subtropical regions. While the genus has been prized for millennia as the source of indigo dye, a substance so valuable it shaped trade routes and dyed the clothes of emperors, this particular species arrived in temperate gardens more recently as ornamental interest in hardy indigoferas grew. The genus name itself preserves this heritage: 'indigo' combined with the Latin 'fero,' meaning to bear. In zones 5 and 6A, gardeners have learned to cultivate it in the manner of an herbaceous perennial, cutting it back each late winter and allowing it to surge forth anew each season, a practice that extends its range well beyond what its tender growth tips might suggest.”