Karanj (Pongamia pinnata, syn. Millettia pinnata) is a hardy, fast-growing evergreen to semi-deciduous tree native to India and tropical Asia. It forms a short trunk and a broad, dense, spreading crown of glossy compound leaves that casts excellent shade. In summer it bears fragrant clusters of pink to white pea-like flowers, followed by woody pods whose seeds yield pongamia (karanj) oil used in biofuel, lamps and traditional medicine. A nitrogen-fixing legume, it improves soil and tolerates drought, salinity and waterlogging, making it a favourite for avenues, reclamation and agroforestry across India.
Specifications
| Family |
Fabaceae |
| Native region |
India and tropical Asia |
| Mature height |
8-15 m |
| Mature spread |
8-12 m |
| Growth rate |
Fast |
| Foliage |
Glossy compound semi-evergreen leaves |
| Flower colour |
Pink to white |
| Flower season |
Spring to early summer |
| Climate zone |
Tropical and subtropical |
Care guide
| Sunlight |
Full sun |
| Watering |
Low; drought-tolerant once established |
| Soil / mix |
Adapts to most soils incl. saline and waterlogged |
| Temperature |
15-42 C; very heat-tolerant |
| Humidity |
Low to high |
| Fertilizer |
Minimal; fixes its own nitrogen |
| Pruning |
Prune to raise canopy and remove deadwood |
| Repotting |
Best planted in ground |
| Propagation |
Seeds and cuttings |
| Pests & problems |
Largely pest-free |
| Toxicity / safety |
Seeds and oil not for ingestion; non-edible oil |
| Difficulty |
Easy |
Uses
Planted as a robust avenue, shade and windbreak tree and for land reclamation. The seed oil (karanj oil) is used for biodiesel, lamps, soaps, pesticides and traditional medicine.
Growing tips
An ideal low-maintenance avenue tree for hot, dry and saline Indian sites; plant in full sun, water until established, and it will then thrive on neglect while enriching the soil.