Star fruit (Averrhoa carambola), or kamrakh, is a small, attractive tropical evergreen tree producing waxy, ribbed yellow fruit that forms a star shape when sliced. The crisp, juicy fruit ranges from tart to sweet and is eaten fresh, in salads, juices and pickles. Ornamental with dense foliage and clusters of small pink-purple flowers, it suits home gardens in warm, humid regions of India such as Kerala, Tamil Nadu, West Bengal and the coastal belt. It prefers frost-free conditions, fertile well-drained soil and protection from strong winds, and can fruit several times a year.
Specifications
| Family |
Oxalidaceae |
| Native region |
Tropical Southeast Asia |
| Mature height |
5-9 m |
| Mature spread |
4-6 m |
| Growth rate |
Moderate |
| Foliage |
Evergreen, soft compound green leaves |
| Flower colour |
Pink to lilac-purple |
| Flower season |
Multiple flushes, mainly warm months |
| Climate zone |
Tropical and subtropical |
Care guide
| Sunlight |
Full sun to partial shade |
| Watering |
Regular; keep soil evenly moist, not waterlogged |
| Soil / mix |
Fertile, well-drained loam, pH 5.5-7 |
| Temperature |
20-35 C; frost-sensitive |
| Humidity |
Prefers moderate to high humidity |
| Fertilizer |
Balanced NPK several times a year |
| Pruning |
Light pruning to shape and manage height |
| Repotting |
Suits large pots; repot as it grows |
| Propagation |
Grafting; seed for rootstock |
| Pests & problems |
Fruit flies, scale, leaf-eating caterpillars |
| Toxicity / safety |
Edible; high oxalates risk for kidney patients |
| Difficulty |
Moderate |
Uses
Grown for juicy, tangy star-shaped fruit eaten fresh, juiced, in salads or pickles. The neat tree also serves as an ornamental.
Growing tips
Star fruit thrives in warm, humid Indian coastal and southern climates; shelter from strong wind, keep soil moist, and plant grafted trees for sweeter, earlier fruit.