Chinese Indigo (Indigofera decora f. alba) is a deciduous shrub native to Japan and China, prized for its stunning white pea-like flowers that bloom prolifically from June through July, sometimes extending into September. This compact variety grows 12-18 inches tall and spreads 24-72 inches wide, thriving in full sun across hardiness zones 5-8. The dense, axillary flower racemes reach up to 8 inches long and emerge from delicate compound leaves with 7-13 leaflets each. It's an excellent choice for creating informal hedges or soft borders, and remarkably, it tolerates drought and even alkaline soils once established. In harsher zone 5 winters, plants may experience tip damage but reliably regenerate from the base in spring.
Full Sun
Moderate
5-8
18in H x 72in W
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High
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Pure white flowers in densely packed, vertical sprays make this form of Chinese Indigo a luminous addition to any garden. It blooms heavily in early summer and often continues sporadically through fall, extending the floral display longer than many shrubs. The fine, delicate foliage provides a soft texture that contrasts beautifully with coarser plants, while the low-maintenance, spreading habit makes it naturally suited to hedging. Even in zone 5's toughest winters, this shrub reliably returns from its roots, rewarding patient gardeners with vigorous regrowth each spring.
Chinese Indigo excels as an informal hedge or border shrub, particularly where gardeners want soft, airy screening without formal pruning demands. Its spreading habit and extended bloom season make it valuable for pollinator gardens, where the pea-like flowers attract bees throughout the summer months. The white flower form offers a counterpoint to pink-flowered varieties, providing designers with options for monochromatic or contrast-based planting schemes. It works well in mixed shrub borders, along property lines, or as a specimen in containers on patios.
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Chinese Indigo flowers on new growth, so prune in late winter to early spring to encourage prolific blooming. You can cut stems back close to the ground herbaceous-perennial style (particularly useful in zones 5-6A for winter protection), or prune more selectively to maintain shape. In milder zones, lighter pruning maintains the natural spreading form. Multiple pruning strategies work well; choose the approach that fits your space and aesthetic goals.
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“Indigofera decora is native to forest margins and streambanks across Japan and China, where it evolved as a spreading understory shrub in temperate woodlands. The white-flowered form, f. alba, was selected from the typical pink-flowered species and represents a deliberate horticultural choice to preserve and propagate this color variant. The genus Indigofera holds deep historical significance, as several species are ancient sources of indigo dye, though I. decora f. alba is grown primarily for ornamental value. Its journey to Western gardens reflects the broader 19th and 20th-century plant exploration that brought East Asian shrubs into cultivation, where its hardiness to zone 5 made it accessible to gardeners far beyond its native range.”