Best used for
- Coastal highways and saline inland stretches where neem struggles
- Industrial belts, ports and refinery peripheries
- Soil improvement plantings — it fixes nitrogen
- Dense evergreen shade over footpaths and service roads
Avenue tree
Karanj
A dense, glossy, nitrogen-fixing shade tree that tolerates salinity, drought and coastal wind — the specialist choice for saline, sandy and coastal corridors.
About Karanj
Pongamia pinnata is the tree that keeps working where the soil report is bad. Salinity, alkalinity, sand, stone, brackish groundwater and coastal wind are all within its range, and it is a legume, so it improves the soil it grows in rather than merely surviving it. On a coastal or industrial corridor it will outlive and out-shade species that look better in a nursery.
The canopy is dense, low-branching and glossy — very good for pedestrian shade on service roads, less good where you want filtered light beneath. Because it branches low, formative pruning in the first three years is essential on any avenue application or the crown will sit in the vehicle envelope.
It has a second life as a biofuel and biomass species, which occasionally brings agronomic advice into landscape projects. Ignore the yield literature when specifying for a road — plant spacing for canopy and shade, not for pod harvest.
Do not use where
- Directly over parking — the pods and sticky leaf drop are a nuisance
- Sites needing a light, open canopy underneath
| Botanical name | Pongamia pinnata |
|---|---|
| Family | Fabaceae |
| Also called | Pongam, Indian beech, Millettia pinnata, Honge |
| Mature height | 8–15 m |
| Spread | 8–12 m dome |
| Growth rate | Moderate |
| Sunlight | Full sun |
| Water need | Low |
| Soil | Tolerates saline, alkaline, sandy and stony soils; also handles periodic waterlogging |
| Climate | Coastal and inland tropics; hardy across peninsular and northern India |
| Flowering | Lilac-white pea flowers, April–June; woody pods persist |
| Spacing | 8–10 m on centre |
| Planting window | June–August |
| Establishment | 2 monsoons |
| Maintenance | Low |
| Pollution tolerance | Very high |
| Drought tolerance | High |
| Transplanting | Good at small to medium girth in monsoon; readily available as tall nursery stock. |
Care
Season-by-season care calendar
| Season | What to do |
|---|---|
| February–March | Lift the crown on avenue trees. Karanj responds well to hard formative pruning while young. |
| April–June | Water fortnightly for the first two summers only. Leaf flush is heavy in spring and looks dramatic — no action needed. |
| July–September | Plant now. Check stakes; the dense canopy catches wind on young trees. |
| October–January | Clear fallen pods from paved areas. Otherwise nothing. |
Troubleshooting
Common problems and what causes them
| Symptom | Cause | Fix |
|---|---|---|
| Leaf galls and blistered foliage | Gall-forming insects, extremely common on karanj | Almost always cosmetic and does not affect vigour. Treat only on high-visibility specimen trees. |
| Sticky residue on cars parked beneath | Honeydew from sap-feeding insects plus pod drop | Do not site over parking. Where it already is, add a scheduled wash in the maintenance scope. |
| Low branches obstructing footpath | Natural low-branching habit, no formative pruning | Prune to a 2.5 m clear stem in years two and three; retrofitting later means removing large limbs. |
Plant with
Species that work alongside it
avenue trees
Neem
Azadirachta indica
The most reliable avenue tree in India: evergreen shade, extreme drought tolerance, no serious pest problems and roots that behave near pavement.
- Height15–20 m
- WaterLow
- MaintenanceLow
flowering shrubs
Oleander (Kaner)
Nerium oleander
The standard Indian median shrub: continuous flowering, near-total drought tolerance, immunity to vehicle pollution — and toxic in every part, which decides where it can go.
- Height2–4 m unpruned; held at 1–1.2 m on medians
- WaterLow
- MaintenanceLow
lawns and groundcovers
Vetiver
Chrysopogon zizanioides
The engineering plant of Indian landscapes: a deep-rooted clumping grass that holds embankments, filters runoff and stops erosion where nothing else will grow.
- Height1–1.5 m clump; trimmed to 300–500 mm in ornamental use
- WaterLow once established
- MaintenanceLow
flowering shrubs
Bougainvillea
Bougainvillea glabra / spectabilis
The hardest-working colour plant in India: months of bract colour on almost no water, provided you resist the urge to feed and irrigate it.
- Height1 m clipped, 3–4 m as a shrub, 8 m+ as a climber
- WaterLow. Over-watering is the single commonest cause of a green, flowerless plant
- MaintenanceModerate
Karanj — frequently asked questions
Which tree survives in saline soil in India?
Karanj (Pongamia pinnata) is the first choice for saline and coastal conditions, followed by Prosopis and casuarina on the harshest sites. Neem tolerates alkalinity but not true salinity as well as karanj.
Is karanj evergreen?
Effectively yes — it drops and re-flushes quickly in spring, so it is never bare for long. This is a real advantage where hot-season shade is the point.
Does karanj improve soil?
Yes. As a legume it fixes atmospheric nitrogen, and the heavy leaf litter builds organic matter, which is why it appears in reclamation and mine-spoil plantings.
Related
Guides and services
Cost and procurement · 5 min read
What Drives the Cost of Highway Plantation in India
The real cost structure of a corridor plantation package — where the money actually goes, which line items get under-quoted, and how to compare two bids that look identical on rate.
Read the guideExecution · 5 min read
Why Plantations Fail: Getting Survival Rates Above 90%
Most plantation losses are decided before planting. A practical breakdown of the six failure points — timing, stock, pits, planting depth, water and ownership — and what a defensible survival audit looks like.
Read the guidePlanning · 5 min read
Monsoon Plantation Planning in India
The monsoon gives you roughly ten weeks of free irrigation a year. A planning guide to using it — regional windows, pre-monsoon preparation, planting sequence and what to do when the programme slips.
Read the guideCorridor execution
Highway and Expressway Plantation
Avenue, median, embankment and interchange planting for expressway and highway packages — designed for survival at handover, not just for the drawing.
Service detailCore service
Landscape Execution and Plantation
Full softscape execution for campuses, townships, industrial sites and public realm — from soil and levels through planting, lawns and irrigation to a working maintenance handover.
Service detailSpecifying Karanj on a project?
We supply, plant and maintain across India. Send the site conditions and quantities and we will confirm whether this species is the right call before you order it.