Naval, jamun in Hindi and jambu in Sanskrit, is the Java plum, a tall evergreen tree whose small, purple-black fruits stain the tongue in early summer. The Puranic name Jambudvipa for India is said to come from it. Jamun seed powder is a popular folk remedy for diabetes, with mixed evidence. Its water-resistant wood was used to line wells.
- Botanical name
- Syzygium cumini (L.) Skeels
- Family
- Myrtaceae
- Tamil
- Naval
- Hindi
- Jamun
- Sanskrit
- Jambū
- Parts used
- Fruit, Seed in lists, Bark in lists
- Habit
- Evergreen jamun tree with purple fruit
- Last updated
- 2026-10-27
How to recognise Naval
It is a tall evergreen tree with smooth, pale grey bark and a dense crown.
The leaves are glossy, oval and opposite, with a turpentine-like smell when crushed.
Small, white, fragrant flowers with many stamens grow in clusters on older branches.
The fruits are oval berries, green turning purple-black, with juicy, astringent flesh and one seed.
Rose apple and wax apple have pale fruits and larger leaves.
Traditional use of Naval
Kitchen
Jamun is eaten fresh with salt in May and June and made into juice, vinegar and jam.
Indian food practice
Folk use
Dried seed powder is taken in folk practice for diabetes.
Indian folk practice
Craft
Jamun wood, which resists water, was used to line wells and make boats.
Indian craft practice
Modern notes on Naval
Small trials of jamun seed for blood sugar show mixed results.
The fruit is rich in anthocyanins and vitamin C.
It is planted as a roadside and windbreak tree across India.
Naval safety
People with diabetes should not replace medicines with jamun seed, and should check sugar levels if using it. The fruit is a safe food.
Ecology and sourcing
It is native to the Indian subcontinent and South-east Asia.
Bees, birds and bats visit its flowers and fruits.
It is invasive in Florida and some Pacific islands.
Related plants
Also in Myrtaceae
Questions about Naval
What is naval?
The Tamil name for jamun.
Does jamun help diabetes?
Evidence is mixed.
When is Naval in season?
May to July.
Why does Naval stain the tongue?
It is rich in purple pigments.
What is Jambudvipa?
An old name for India, linked to jamun.
Sources
- Syzygium cumini (L.) Skeels — Plants of the World Online, Kew (search) (accessed 2026)
- Wikidata item Q232571 (Syzygium cumini)
Educational page about a plant. It is not medical advice, not a diagnosis, and not an offer to sell. Traditional use is historical. If you need care, ask a licensed clinician. Questions: hello@meevamed.com.