How long until it fruits?

Grafted trees can fruit in 3 to 5 years, while seed grown trees take much longer.

Does it need full sun?

Yes, it thrives in full sun for optimal fruit production.

Plant guide

Java plum.

Syzygium cumini

Pronounced sih-ZID-jee-um KYOO-min-eye

Also known as Black Plum, Black plum, Jambolan, Java plum, Jamun, Black plum tree, Indian blackberry, Java plumtree, Portuguese plum, Jamun, Java plum, Java-plum, Malabar plum, Malabar-plum, Portuguese-plum

The Java plum is a beautiful, fast growing tropical tree known for its dense canopy and edible, dark purple fruit. It thrives in warm climates and is often grown for both its ornamental value and its delicious harvest. You will love how quickly it establishes itself in a sunny spot.

Another photo of Java plum — Photo by P Jeganathan (CC BY) via iNaturalist

At a glance

Care level: Moderate
Plant type: Evergreen tree
Light: Full sun
Indoor light: Direct sun
Water: Every 3 to 7 days
Mature size: 30 meters
Growth rate: Fast
Hardiness: USDA 10 to 12
Bloom time: Late spring to early summer

Care

Provide plenty of sunlight and consistent moisture to keep this tree happy. Watch for yellowing leaves, which may indicate poor drainage or nutrient deficiency. It prefers a humid environment and protection from harsh frost.

Watering: Keep the soil consistently moist but never waterlogged.
Feeding: Apply a balanced fertilizer during the active growing season.
Pruning: Prune annually to maintain shape and encourage fruit production.
Repotting: Repot young trees every year or two until they reach their final size.
Soil: Well-draining, loamy soil
Soil pH: 5.5 to 7.5
Temperature: 5 to 40°C
Humidity: 60 to 90%
Drought tolerance: Moderate
Fragrance: Light

Safety

People: The seeds contain alkaloids that may be toxic if consumed in large quantities.
Pets: This plant is generally considered non-toxic to cats and dogs.
Children: The small, dark fruits can be a choking hazard for very young children.
Contact allergens: The sap may cause mild skin irritation in sensitive individuals.
Airborne allergens: The pollen can trigger mild allergic reactions in some people during the flowering season.
Edibility: The fruit is edible but should be consumed in moderation as excessive intake may cause digestive upset.

How to identify it

Glossy, leathery, dark green leaves
Fragrant, white, clustered flowers
Oval, deep purple to black fruit
Rough, greyish brown bark

Height: 10 to 30m
Spread: 5 to 15m
Leaves: green, evergreen
Flowers: white, cream, 0.5 to 1cm
Fruit: purple, black, Late summer to autumn

Problems to watch for

Leaf spot · Fungal infections causing dark spots on leaves during high humidity.
Stem borer · Larvae that tunnel into the wood and weaken branches.

By symptom

Plant problems by symptom

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Growing it

Propagation: seed, cuttings, grafting
When to plant: spring, early monsoon

Plant in a spacious area as this tree grows quite large and casts heavy shade.

Grows well with

Mango · They share similar environmental needs in tropical orchards.
Guava · Both trees benefit from similar soil moisture levels.

Similar species

Wax Apple · It is a closely related species with similar growth habits.

Science

Family: Myrtaceae
Genus: Syzygium
Order: Myrtales
Class: Magnoliopsida
Native range: Tropical Asia and the Indian subcontinent.
Conservation: It is not currently listed as endangered or threatened in its native range.

It thrives in riparian zones and moist forests, often spreading through bird dispersal of its seeds.

Value to wildlife: nectar source, fruit source for birds
Pollinators: bees, butterflies
Uses: fruit production, shade tree, windbreak, traditional medicine

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 8/9
Temperature: 9/9
Moisture: 7/9
Nutrients: 6/9

Taxonomy resolved against GBIF.

Questions people ask

How long until it fruits?: Grafted trees can fruit in 3 to 5 years, while seed grown trees take much longer.
Does it need full sun?: Yes, it thrives in full sun for optimal fruit production.

Where the name comes from

The name Syzygium comes from the Greek word for joined, referring to the paired leaves, while cumini refers to the resemblance of the seeds to cumin.

Good to know

The tree is considered sacred in some cultures.
The wood is water resistant and used for building wells.
The fruit juice is often used to make refreshing beverages.
It is a fast growing tree that can live for over a century.

Keep your java plum growing

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This guide was generated with AI on October 30, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.