Jamun Tree (Syzygium cumini): Where It Grows in India and How to Care for It

Jamun is native to India, Sri Lanka, Myanmar, Thailand, Malaysia and the Philippines. The ICRAF agroforestry database says it grows across India "except in the very arid regions" and is found in all major Indian forest types apart from the very arid ones. It prefers moist, even marshy ground, and on dry sites it keeps close to watercourses. In Himalayan valleys it reaches about 1,200 m (ICRAF); TNAU gives up to 1,300 m.

Regions. Jamun grows well with the monsoon across the northern plains, central India, the east, the north-east, the west and east coasts and the southern peninsula. In the north-east, avoid pits where water stands for long. Two regions need care: the lower Himalayan hills, where young plants are at risk from frost, and the north-west dry zone, where rain alone is not enough. The planting months for each region are in the Planting calendar.

Rainfall and water. ICRAF puts jamun's natural rainfall range at 900–1,200 mm a year. In drier regions, such as the north-west dry zone, rain alone is not enough. Once established, jamun can survive drought, but surviving is not fruiting. TNAU advises watering bearing trees in May and June, while the fruit fills, which is the hottest part of the year on the northern plains. A jamun left dry through May will usually live, but expect a thin crop or none.

Cold. Mature trees are frost hardy, but young plants are sensitive. Protect them in their first winters wherever nights fall below freezing, as they can in the hills.

Where to plant in dry regions. In the north-west and other dry areas, plant jamun where water is already part of the place: a lawn that gets watered anyway, a school, temple or office campus, a farm boundary near a well or tubewell. TNAU notes that farmers have long grown it near farm houses and wells, and that is the right model. It is not a tree for a dry roadside.

Soil. Jamun grows on many soils, including alluvial, lateritic and limestone soils, and some strains tolerate salinity, but it does best on deep, well-drained loam. TNAU says it is not economical on very light sandy soil, so improve the pit generously on sandy ground. Useful Tropical Plants, citing FAO Ecocrop, gives a preferred soil pH of 5.5–7, tolerating 4.5–8. On very alkaline, chalky soil TNAU notes that iron, manganese, zinc and phosphorus become hard for roots to take up, so test the soil first on such patches (see Soil pH).