Sweet Indrajao

Sweet indrajao (Wrightia tinctoria), known in the region as indarjau, is a small Apocynaceae tree carrying white star-shaped flowers, and the honest reason a grower plants it is its fine, even-grained white wood paired with a deep bench of traditional medicinal uses.¹ It is an unhurried, ornamental-but-useful tree for the secondary layer.

Where it thrives

Native across Bangladesh, India and Myanmar, it belongs to the seasonally dry tropical belt, which puts the Punjab plains and the warmer Sindh coast well within its range.¹ It is a small to medium deciduous tree, typically a few metres to a dozen or so, that takes heat and drought and is not fussy about soil so long as drainage is reasonable. Hot summers, mild winters and a defined dry season suit it, and it holds its own on the kind of marginal ground where you would not waste a productive fruit tree.

Role in the system

In a syntropic guild indarjau works as a secondary-layer tree, sitting below the climax canopy and adding mid-storey structure rather than competing for the top tier. Its slim, deciduous habit lets light filter through to the shrub and ground layers beneath, so it shades without smothering. Leaf fall feeds the chop-and-drop cycle, and prunings double as mulch returned directly to the soil surface. Because it tolerates lopping, it can be cut back to manage height and density and to thicken a screen, making it a quiet contributor to internal windbreak and visual structure within the planting. Its foliage has also served as livestock fodder, adding a browse function to its place in the guild. Treat it as a companion and succession species: a tree that fills space and earns several small keeps while the slower climax members mature around it.

Growing it

It is raised from seed, which the long paired follicles supply generously, and it can also be struck from cuttings. Give it full sun for the best flowering and frame; it tolerates partial shade but stays leggier. Water it through establishment, then lean on its drought tolerance. Prune after flowering to shape it and to harvest leaf for mulch or fodder, and coppice if you want a denser, lower screen rather than a single-stemmed tree.

What you get

The standout return is the timber: a close-grained, ivory-white wood prized for carving, turnery and small joinery.¹ Beyond that, the bark, leaves and seeds underpin a long pharmacopoeia in Ayurveda, Siddha and Unani practice, and the bark in particular has drawn modern interest for its polyphenol content.²³ The leaves yield an indigo-like dye, a minor cottage-scale return. None of these is a bulk commodity, but as a mid-layer multipurpose tree it pulls more than its weight.

Sourcing notes

Collect ripe follicles from a healthy local tree and sow the winged seed fresh, or take semi-hardwood cuttings from vigorous growth. Plant it as an internal secondary-layer tree among your climax plantings where its light shade and prunings benefit the layers below, rather than as a solid perimeter block.

Sources

1. Royal Botanic Gardens, Kew (2024). “Wrightia tinctoria (Roxb.) R.Br.” Plants of the World Online.
2. Srivastava, R. (2014). “A review on phytochemical, pharmacological, and pharmacognostical profile of Wrightia tinctoria: Adulterant of kurchi.” Pharmacognosy Reviews.
3. Fatima, N. et al. (2016). “Anticancer, antioxidant potential and profiling of polyphenolic compounds of Wrightia tinctoria Roxb. (R.Br.) bark.” Journal of Advanced Pharmaceutical Technology & Research.