Ambarella

The ambarella is native to the Society Islands of Melanesia and Polynesia in the South Pacific. From its center of origin, it spread throughout the tropics via human migration and trade, becoming naturalized and widely cultivated in Southeast Asia, the Caribbean, South Asia, and parts of Central and South America.

Ambarella is a fast-growing, deciduous or semi-deciduous tree typically reaching 10 to 25 meters in height with a straight trunk and a rounded, spreading crown.

Bark & Trunk:
• Trunk is stout, often buttressed in older trees
• Bark is light greyish-brown, smooth to shallowly fissured, with prominent leaf scars

Leaves:
• Alternate, pinnately compound, 20 to 60 cm long
• Composed of 9 to 25 glossy, ovate-lanceolate leaflets, each 5 to 10 cm long
• Leaflet margins are serrate or entire, with a pointed apex
• Foliage emits a distinct resinous or turpentine-like aroma when crushed

Flowers:
• Small, white to yellowish, borne in large terminal panicles up to 30 cm long
• Flowers are pentamerous (five-parted), with 10 stamens and a superior ovary

Fruit:
• A drupe, oblong to oval, 4 to 10 cm long and 3 to 8 cm wide
• Skin is thin but tough, turning from green to golden-yellow upon ripening
• Flesh is pale yellow, juicy, and very fibrous, enclosing a single, large, spiny endocarp (stone) containing 1 to 5 seeds

Ambarella thrives in warm, humid tropical lowlands and is well-suited to a range of ecological conditions.

Climate & Elevation:
• Requires a frost-free climate; optimal growth below 700 meters elevation
• Thrives in areas with a distinct dry season, which can promote flowering and leaf drop

Soil:
• Adaptable to a wide range of soil types, from sandy loams to clays
• Prefers well-drained soils with a slightly acidic to neutral pH (5.5 to 7.0)
• Tolerates poor soils and seasonal waterlogging better than many other fruit trees

Pollination:
• Flowers are pollinated by insects, particularly bees and flies
• Some cultivars may exhibit self-incompatibility, requiring cross-pollination for optimal fruit set

Ambarella fruit is a good source of several nutrients, with composition varying by ripeness stage.

Unripe Fruit:
• High in pectin and dietary fiber
• Rich in vitamin C (ascorbic acid), though levels decrease with ripening
• Contains significant amounts of calcium and phosphorus

Ripe Fruit:
• Good source of provitamin A carotenoids and vitamin C
• Contains iron, calcium, and B-complex vitamins
• Pulp is composed of approximately 85% water, 10% carbohydrates, and 1% protein by weight

The milky sap from the tree and the unripe fruit can cause contact dermatitis or irritation in sensitive individuals, a characteristic shared with other members of the Anacardiaceae family. The spiny stone is a physical hazard if swallowed.

Ambarella is a low-maintenance tree easily propagated and grown in tropical home gardens.

Propagation:
• Most commonly grown from seed, which germinates readily in 3 to 4 weeks
• Superior cultivars are propagated by budding, grafting, or large hardwood cuttings to maintain fruit quality

Planting:
• Saplings are planted at the onset of the rainy season in a sunny location
• Spacing of 8 to 10 meters is recommended for orchard planting

Light:
• Full sun is essential for healthy growth and abundant fruiting

Watering:
• Young trees require regular watering for establishment
• Mature trees are highly drought-tolerant once established but benefit from irrigation during prolonged dry periods

Pruning:
• Minimal pruning is required; remove dead or crossing branches to shape the tree
• The brittle wood is susceptible to breakage from strong winds

Harvesting:
• Trees begin bearing fruit 2 to 4 years after planting from seed
• Fruit is harvested manually when it reaches full size but is still green and firm for savory uses, or when it turns golden-yellow and falls from the tree for sweet consumption