Best used for
- Highway medians, flyover planters and roundabouts
- Slope and embankment cover where irrigation is unreliable
- Compound walls, pergolas and screening on trellis
- Any site where colour is required and water is not available
Flowering shrub
Bougainvillea
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.
About Bougainvillea
Bougainvillea is the reason Indian flyovers have colour. It flowers on drought, heat and neglect, holds bract colour for weeks rather than days, and covers ground fast enough to suppress weeds on an embankment. On a median with a broken drip line and one maintenance visit a quarter, it is often the only thing still performing.
The care instructions are counter-intuitive, and getting them wrong is the usual failure. It flowers in response to stress: dry soil, poor nutrition, root restriction. Give it a rich bed and daily water and you get a vigorous green thicket with no colour at all. On projects, that means keeping bougainvillea off the lawn irrigation zone and on its own low-frequency line.
Pruning drives the display. Bracts form on new growth, so a hard cut back after each flush, followed by a dry spell, resets the plant for the next one. Two hard prunes a year — after monsoon and after the main spring flush — will keep a median mass tight, under sight-line height and repeatedly in colour.
Do not use where
- Pedestrian edges and school frontages without thornless cultivars — the thorns are serious
- Irrigated lawn beds, where it grows lush and never flowers
- Deep shade
| Botanical name | Bougainvillea glabra / spectabilis |
|---|---|
| Family | Nyctaginaceae |
| Also called | Paper flower, Booganvel, Kagaz phool |
| Mature height | 1 m clipped, 3–4 m as a shrub, 8 m+ as a climber |
| Spread | 2–4 m |
| Growth rate | Fast |
| Sunlight | Full sun — six hours minimum, or it will not colour |
| Water need | Low. Over-watering is the single commonest cause of a green, flowerless plant |
| Soil | Poor, sharply drained, even gravelly. Rich soil produces leaves instead of bracts |
| Climate | All of tropical and subtropical India; slows in cold but recovers |
| Flowering | Repeat flushes almost year-round, heaviest in the dry months and after stress |
| Spacing | 1–1.5 m for median massing; 2–3 m for shrub form |
| Planting window | February–March and July–September |
| Establishment | 3–4 months |
| Maintenance | Moderate |
| Pollution tolerance | Very high |
| Drought tolerance | Very high |
| Transplanting | Poor once established — the root system is brittle and resents disturbance. Plant it where it stays. |
Care
Season-by-season care calendar
| Season | What to do |
|---|---|
| February–March | Hard prune after the winter flush. Cut back to a framework; do not be timid. Withhold water for two weeks after pruning to trigger the next flush. |
| April–June | Peak performance season. Water sparingly — deep, infrequent, and only if plants wilt at dawn rather than at noon. |
| July–September | Growth is vegetative and flowering pauses. Prune to control spread and keep the mass off the carriageway. Do not fertilise with nitrogen. |
| October–January | Second major flush. Light shaping only; a phosphorus-heavy feed at low rate can strengthen bract colour. |
Troubleshooting
Common problems and what causes them
| Symptom | Cause | Fix |
|---|---|---|
| Lush green growth, no flowers | Too much water, too much nitrogen, or both | Cut irrigation frequency by half, stop nitrogen entirely, prune hard and let the plant dry. Colour returns within four to six weeks. |
| Thorn injuries during maintenance | Species characteristic on most cultivars | Gauntlets and eye protection for crews as standard. On public edges, specify low-thorn cultivars or set the mass back 600 mm from the kerb. |
| Mass sprawling into the carriageway | Fast growth plus infrequent pruning cycles | Two hard prunes a year minimum in the maintenance contract; four for high-visibility urban medians. |
Plant with
Species that work alongside it
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
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
Portulaca
Portulaca grandiflora
A succulent seasonal groundcover that flowers hardest in the worst heat — the cheap, cheerful colour used on medians, roundabouts and traffic islands through Indian summers.
- Height100–200 mm
- WaterVery low
- MaintenanceLow, but treat as seasonal and expect replacement
palms
Silver Date Palm
Phoenix sylvestris
India’s native date palm and the toughest formal palm available: silver-blue crown, diamond-cut trunk, indifferent to heat, drought, dust and cold.
- Height10–15 m mature
- WaterLow once established
- MaintenanceLow
Bougainvillea — frequently asked questions
Why is my bougainvillea not flowering?
Nine times out of ten: too much water and too much nitrogen. It flowers under mild stress. Move it off the lawn irrigation line, stop feeding, prune hard, then let it dry out.
Is bougainvillea good for highway medians?
It is arguably the best median shrub in India — extreme drought tolerance, months of colour, high pollution tolerance and rapid cover. Budget for two hard prunes a year to hold it under sight-line height.
How often should bougainvillea be watered?
Once established, once every 7–10 days in summer and not at all in monsoon. Frequent shallow watering is the most common mistake.
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Service detailSpecifying Bougainvillea 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.