Best used for
- Highway and expressway medians — the classic application
- Toll plaza islands, roundabouts and slip-road noses
- Industrial boundaries and dusty low-water sites
- Coastal and saline locations
Flowering shrub
Oleander (Kaner)
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.
About Oleander (Kaner)
Nerium oleander is on nearly every Indian median for good reason. It flowers for the better part of the year, ignores drought, shrugs off dust and exhaust, tolerates saline groundwater, and holds a clipped 1 m height with two cuts a year. As a maintenance proposition it is close to unbeatable.
The toxicity is not a footnote. Every part of the plant — leaves, stems, flowers, sap, and the smoke from burning clippings — is seriously poisonous. That does not disqualify it from public landscapes; it disqualifies it from specific ones. On a fenced expressway median it is entirely appropriate. Outside a school gate or in a residential play area it is not, and no amount of signage fixes that.
Handling matters too. Maintenance crews should wear gloves, avoid eye contact with the sap, never burn clippings, and dispose of prunings through the normal green-waste route. Put those instructions in the maintenance contract rather than assuming them.
Do not use where
- School frontages, playgrounds, hospital gardens and any grazing-accessible edge — all parts are toxic if ingested
- Enclosed courtyards where clippings might be burned; the smoke is hazardous
- Shaded locations, where it becomes leggy and stops flowering
| Botanical name | Nerium oleander |
|---|---|
| Family | Apocynaceae |
| Also called | Kaner, Rosebay, Arali |
| Mature height | 2–4 m unpruned; held at 1–1.2 m on medians |
| Spread | 1.5–3 m |
| Growth rate | Moderate to fast |
| Sunlight | Full sun |
| Water need | Low |
| Soil | Any drained soil, including poor, alkaline and mildly saline |
| Climate | Excellent across the whole Indian plains; tolerates both 47 °C and NCR winters |
| Flowering | Pink, white or red clusters, February–November — effectively nine months |
| Spacing | 1–1.5 m on centre for a continuous median mass |
| Planting window | February–March and June–September |
| Establishment | 3–4 months |
| Maintenance | Low |
| Pollution tolerance | Very high |
| Drought tolerance | Very high |
| Transplanting | Moves easily at small to medium size; commonly relocated during road works. |
Care
Season-by-season care calendar
| Season | What to do |
|---|---|
| February–March | Hard prune to shape and to remove leggy growth. Oleander regenerates readily from old wood, so a hard cut is safe. |
| April–June | Peak flowering with almost no irrigation. Water only newly planted stock. |
| July–September | Second light trim to hold sight-line height. Watch for oleander caterpillar defoliation. |
| October–January | Flowering slows. Clear the base of the mass so it does not thin out from below. |
Troubleshooting
Common problems and what causes them
| Symptom | Cause | Fix |
|---|---|---|
| Rapid defoliation by orange-and-black caterpillars | Oleander caterpillar (Syntomeida), a recurring seasonal pest | Hand-remove on small plantings; on median-scale masses use a Bt-based spray. Plants recover fully — do not over-react with broad-spectrum insecticide. |
| Leggy plants with bare bases | Shade or no hard pruning for several years | Cut back hard to 300 mm in February. It regrows dense within one season. |
| Yellow leaves with dieback | Waterlogging, or in southern India possibly oleander leaf scorch bacterial disease | Check drainage first. If dieback spreads plant-to-plant along a row, remove affected plants — there is no cure for the bacterial disease. |
Plant with
Species that work alongside it
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
flowering shrubs
Yellow Bells (Tecoma)
Tecoma stans
A tough yellow-flowering shrub that blooms almost continuously in Indian heat — the standard companion to oleander and bougainvillea on medians and roundabouts.
- Height2–4 m; held at 1–1.5 m with pruning
- WaterLow to moderate
- MaintenanceModerate
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
palms
Washingtonia Palm
Washingtonia robusta
The fastest tall palm available in India — a slender fan palm that gains a metre a year and thrives on heat, drought and neglect, at the cost of a heavy annual trim.
- Height18–25 m eventually; commonly used at 4–8 m
- WaterLow once established
- MaintenanceModerate
Oleander (Kaner) — frequently asked questions
Is oleander safe to plant in public areas?
On fenced medians and industrial boundaries, yes — that is standard practice worldwide. Near schools, playgrounds, hospitals and grazing land, no. The plant is toxic in every part.
Which shrub flowers longest on Indian highways?
Oleander and bougainvillea, both close to nine months a year. Oleander needs less pruning; bougainvillea gives stronger colour.
How often does oleander need pruning on a median?
Two cuts a year holds it at 1–1.2 m. Skipping to one cut a year produces a 2 m sight-line obstruction within eighteen months.
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 guideHighway plantation · 5 min read
Choosing Species for Highway Median Plantation
A specification-grade guide to median planting: width thresholds, sight-line limits, species that survive dust and drought, planting densities and the maintenance cycle each choice commits you to.
Read the guideMaintenance · 4 min read
Landscape Maintenance Contracts (AMC) in India
How to write and evaluate a landscape AMC — frequency tables, measurable standards, replacement turnaround, irrigation servicing, reporting and the pricing models that quietly guarantee decline.
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 detailAnnual contract
Landscape and Greenery Maintenance (AMC)
Annual maintenance contracts that keep planted assets looking deliberate — with a written calendar, defined KPIs and reporting instead of an unscheduled crew.
Service detailSpecifying Oleander (Kaner) 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.