Best used for
- Parks, campus lawns and wide green belts with space around the crown
- Set-back rows well away from carriageways and buildings
- Seasonal colour in large civic landscapes
Avenue tree
Gulmohar
The spectacular scarlet umbrella tree of Indian summers — fast, dramatic and structurally weak, which is why placement matters more than for any other avenue species.
About Gulmohar
Delonix regia is the tree everyone asks for and few specifications should actually place near traffic. In flower it is unmatched — a solid scarlet umbrella over a whole road. The problem is mechanical: fast growth produces brittle wood, the canopy is broad and heavy, and the root plate is shallow and spreading. The first serious pre-monsoon squall of the season reliably brings gulmohar limbs down somewhere in every Indian city.
That does not make it a bad tree. It makes it a park tree, a green-belt tree, a set-back avenue tree with 8 m of clearance to anything that matters. Placed there, it delivers more visual impact per rupee than anything else in the palette and grows fast enough to matter within five years.
Its roots are the other reason for distance. They run shallow and wide, lift paving, invade drains, and resent the trenching that inevitably happens along a road. Give it soft ground on all sides and both problems disappear.
Do not use where
- Over live carriageways, parking bays and footpaths — limb failure is common in pre-monsoon squalls
- Within 8 m of buildings, boundary walls, drains or service ducts
- Narrow verges and medians of any width
| Botanical name | Delonix regia |
|---|---|
| Family | Fabaceae |
| Also called | Flame of the forest, Royal poinciana, Krishnachura |
| Mature height | 8–12 m |
| Spread | 10–15 m, distinctly umbrella-shaped |
| Growth rate | Fast |
| Sunlight | Full sun |
| Water need | Low to moderate |
| Soil | Well-drained; tolerates poor soil but needs room for a wide shallow root plate |
| Climate | Tropical and subtropical; frost-sensitive when young |
| Flowering | Scarlet-orange clusters, April–June, often before full leaf |
| Spacing | 10–12 m on centre |
| Planting window | June–August |
| Establishment | 1–2 monsoons; among the fastest here |
| Maintenance | Moderate |
| Pollution tolerance | High |
| Drought tolerance | High |
| Transplanting | Poor at large size — brittle wood and a shallow spreading plate make big moves unreliable. |
Care
Season-by-season care calendar
| Season | What to do |
|---|---|
| February–March | Structural pruning while the tree is young — establish a single leader and well-spaced scaffold limbs. This is the intervention that prevents future limb failure. |
| April–June | Peak flowering. Inspect large limbs for cracks and included bark before the storm season, and reduce end-weight on over-extended branches. |
| July–September | Plant now. Check stakes and ties after each storm; young trees rock badly in saturated soil. |
| October–January | Deciduous period — the best time to assess and correct structure. |
Troubleshooting
Common problems and what causes them
| Symptom | Cause | Fix |
|---|---|---|
| Large limbs breaking in storms | Brittle wood plus narrow, included-bark branch unions never corrected when young | Formative prune in years two to five. On mature trees, reduce end-weight rather than topping, and accept that some specimens near targets should be removed. |
| Surface roots lifting paving | Shallow spreading root plate | Distance is the only real solution. Root pruning near a mature gulmohar creates a windthrow hazard and should be avoided. |
| Sparse flowering in humid or shaded sites | Insufficient light or too much nitrogen | Full sun is essential. Stop feeding — vegetative vigour comes at the cost of bloom. |
Plant with
Species that work alongside it
avenue trees
Amaltas
Cassia fistula
The classic Indian flowering avenue tree — cascading golden racemes through the hottest weeks of the year, on a medium tree with well-behaved roots.
- Height8–12 m
- WaterLow to moderate
- MaintenanceLow
avenue trees
Tabebuia (Pink Trumpet Tree)
Tabebuia rosea
The tree that turns whole streets pink for three weeks in late winter — medium-sized, well-behaved and increasingly the signature avenue tree of Bengaluru and Hyderabad.
- Height8–15 m
- WaterModerate
- MaintenanceLow
lawns and groundcovers
Korean Grass
Zoysia tenuifolia / Zoysia japonica
The fine, soft, deep-green ornamental turf of premium Indian landscapes — beautiful, slow, weed-resistant once closed, and completely unsuited to foot traffic.
- HeightMown at 15–25 mm; often left unmown as a mounded carpet
- WaterModerate
- MaintenanceModerate
lawns and groundcovers
Wedelia
Sphagneticola trilobata
The fastest green cover in Indian landscaping — a yellow-flowered creeper that blankets slopes and bed edges in months, and needs a hard edge because it will not stop.
- Height150–300 mm
- WaterModerate
- MaintenanceModerate — mostly containment
Gulmohar — frequently asked questions
Is gulmohar safe to plant along roads?
Only well back from the carriageway. Its brittle limbs and shallow roots make it a poor choice inside the clear zone or over footpaths and parking. As a set-back green-belt tree it is excellent.
How fast does gulmohar grow?
Very fast — 1.5–2 m a year in youth, with a usable canopy in four to five years. That speed is exactly why the wood is weak.
Why is my gulmohar not flowering?
Almost always shade or over-feeding. It needs full, unobstructed sun, and a young tree may take four to six years before its first real display.
Related
Guides and services
Core 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 detailAdvisory
Greenery and Plantation Consulting
Advice before execution — species strategy, plantation planning, tender scope review and honest assessment of what a site and its maintenance budget can actually sustain.
Service detailSpecifying Gulmohar 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.