Langka Artocarpus heterophyllus

About Langka

Langka, scientifically known as Artocarpus heterophyllus, is a large tropical evergreen tree belonging to the family Moraceae (the mulberry family). Known internationally as jackfruit and throughout Southeast Asia by various names including nangka, it holds the remarkable distinction of producing the largest fruit of any tree in the world — individual fruits can weigh anywhere from 10 to 35 kilograms and reach up to 90 centimeters in length. In the Philippines, langka is one of the most beloved and culturally significant fruit trees, found in backyards, farms, and along roadsides throughout the archipelago.

The tree itself is impressive in scale, growing 10 to 20 meters tall with a dense, dome-shaped canopy of large, dark green, glossy leaves. The trunk and main branches bear fruit directly in a phenomenon called cauliflory — the heavy fruits grow from short stalks attached to the trunk and older branches rather than from the tips of twigs, which allows the tree to support such massive weight. The exterior of the fruit is covered in small, blunt spines and exudes a sticky white latex when cut.

What makes langka uniquely versatile in Filipino cooking is that it serves two completely different culinary purposes depending on maturity. Young, unripe langka has a neutral flavor and a fibrous, meat-like texture that shreds similarly to pulled pork, making it one of the best natural plant-based meat substitutes available. Ripe langka, on the other hand, produces sweet, aromatic golden-yellow arils with a flavor often described as a combination of banana, pineapple, and mango — the beloved filling for halo-halo, turon, and langka con yelo.

History and Discovery

Artocarpus heterophyllus was formally described by the French naturalist Jean-Baptiste Lamarck in 1789. The genus name Artocarpus comes from the Greek words artos (bread) and karpos (fruit), referring to the starchy, bread-like texture of the cooked fruit. The species name heterophyllus means "different leaves," noting the variation in leaf shapes found on a single tree — young trees produce lobed leaves while mature branches bear entire, unlobed leaves.

The jackfruit originated in the rainforests of the Western Ghats in India and has been cultivated in South and Southeast Asia for thousands of years. Archaeological evidence and historical texts from India mention jackfruit cultivation dating back at least 3,000 years. From India, it spread to Malaysia and Indonesia through ancient trade routes, and was eventually brought to the Philippines by Malay settlers long before Spanish colonization. By the time the Spanish arrived in the 16th century, langka was already deeply established in Philippine agriculture and cuisine.

In the Philippines, langka has always been a tree of the people — inexpensive, abundant, and generous in yield. A single mature tree can produce 100 to 200 fruits per year, providing food security for families throughout the provinces. The provinces of Laguna, Quezon, Batangas, and the Visayas are particularly known for their langka production. In recent years, the global vegan and plant-based movement has elevated young jackfruit to international prominence as a meat alternative, sparking renewed commercial interest in Philippine langka production.

How to Plant Langka

Propagation methods: Seed, Grafting, Marcotting (air-layering)

Germination time: 10 to 21 days from fresh seed

Best planting season in the Philippines: June to August, at the onset of the rainy season

Step-by-Step Planting Guide

1. Select your planting material. For the fastest path to fruiting, purchase grafted seedlings from DA-accredited nurseries or agricultural colleges like UPLB. Grafted trees fruit in 3 to 4 years versus 5 to 8 years for seed-grown trees. If planting from seed, extract seeds from a ripe fruit and plant within 3 to 5 days — langka seeds lose viability quickly once removed from the fruit.
2. Choose a permanent site. Langka grows into a very large tree, so plan for the long term. Select a spot with full sun exposure, at least 10 to 12 meters away from buildings, power lines, and other trees. The ideal location in a typical Filipino lot is the far corner of the backyard or along the property boundary where the eventual canopy spread of 6 to 10 meters will not cause problems.
3. Prepare the planting hole. Dig a hole at least 50 cm wide and 50 cm deep. Mix the excavated soil with well-decomposed compost or aged animal manure in a 2:1 ratio. Langka thrives in deep, rich, well-drained soil and performs poorly in shallow or waterlogged ground.
4. Plant the seed or seedling. For seeds, plant horizontally about 5 cm deep in moist soil. For grafted seedlings, position the root ball at ground level, ensuring the graft union remains above the soil line. Backfill with the amended soil mixture and press firmly to eliminate air pockets.
5. Water thoroughly during establishment. Water deeply twice a week for the first 6 months. Young langka trees need consistent moisture to develop their deep taproot system. Once established (after the first dry season), the tree becomes moderately drought-tolerant but will produce significantly more fruit with regular watering, especially during flowering and fruit development periods from February to June.
6. Provide early care and training. Stake young trees if they are in wind-exposed areas. Apply mulch in a 1-meter radius around the base to conserve moisture and suppress weeds. Begin formative pruning after 2 years to develop a strong scaffold structure with 3 to 4 well-spaced main branches.

Care Guide

Sunlight

Requirement: Full Sun

Langka requires full sun — a minimum of 6 to 8 hours of direct sunlight daily for healthy growth and fruit production. The tree will grow in partial shade but fruit production drops dramatically without sufficient sun exposure. In the Philippine setting, ensure the tree is not shaded by taller structures or other large trees, especially as it develops. Young seedlings can tolerate light afternoon shade during their first year but should be transitioned to full sun as soon as possible.

Water

Frequency: 1 to 2 times per week (established trees)

Established langka trees are moderately drought-tolerant thanks to their deep taproot system. During the dry season (March to May), water deeply once or twice per week to support fruit development. During the rainy season, supplemental watering is unnecessary. Young trees under 2 years old require more consistent moisture — water twice weekly throughout the year. The key is deep watering that reaches the root zone rather than frequent shallow irrigation. Langka tolerates brief waterlogging better than moringa but will eventually suffer root rot in permanently saturated soil.

Soil

Type: Deep Loam, Alluvial, Sandy Loam

pH Range: 6.0 to 7.5

Langka grows best in deep, fertile, well-drained alluvial or loamy soil. It is remarkably adaptable and can grow in a range of soil types found across the Philippines, from the volcanic soils of Laguna to the limestone-derived soils of the Visayas. The tree does not perform well in shallow, rocky soil or in areas with a high water table. For optimal growth and fruit production, the soil should be at least 1.5 meters deep with no hardpan layer that would restrict taproot development.

Humidity and Temperature

Humidity: 60 to 80%

Temperature: 25°C to 35°C

Langka thrives in the warm, humid lowland tropics — the standard climate of most Philippine provinces. It grows best at elevations below 600 meters above sea level, where temperatures remain consistently warm year-round. The tree is sensitive to prolonged cold and will not thrive in Philippine highland areas above 1,000 meters (such as Baguio or the Cordillera). It handles the high humidity of the monsoon season well and requires temperatures above 20°C for flowering and fruit set.

Fertilizer

Young trees (1 to 3 years): Apply complete fertilizer (14-14-14) at 200 to 500 grams per tree every 3 months. Bearing trees: Switch to a high-potassium formulation (e.g., 10-10-20) to promote flowering and fruit development. Apply 2 to 5 kilograms of complete fertilizer per year, split into quarterly applications. Supplement with 5 to 10 kilograms of well-decomposed organic compost or manure spread around the drip line each quarter. Avoid excessive nitrogen, which promotes vegetative growth at the expense of fruiting.

Pruning

Unlike malunggay, langka should not be pruned aggressively since fruit develops on the trunk and main branches. Limit pruning to the removal of dead wood, crossing branches, and water sprouts. Maintain a clear trunk of 1.5 to 2 meters from the ground for easy access to fruits that develop on the lower trunk. After a heavy fruiting season, thin out weak interior branches to improve air circulation and light penetration. Major pruning is best done immediately after the main harvest period.

Growing Medium Options

Langka is exclusively a ground-planted tree due to its massive size, deep taproot, and heavy fruit production. There is no practical way to grow a productive langka tree in containers, hydroponics, or any soilless system long-term. The tree requires deep, unrestricted soil — a minimum of 1.5 meters depth — for proper root development and structural stability to support fruits weighing up to 35 kilograms. Young seedlings may be started in large nursery bags (at least 30 cm diameter) for the first 6 to 12 months before transplanting to their permanent ground position, but this is the only acceptable container stage.

Edible Uses and Nutrition

Edible parts: Ripe arils (flesh), Young unripe fruit, Seeds, Young leaves (rarely)

Culinary Uses

Langka occupies a unique dual role in Filipino cuisine — it is both a fruit and a vegetable depending on its stage of maturity. Ripe langka provides sweet, golden-yellow arils that are eaten fresh, used as a topping for halo-halo (the iconic Filipino shaved ice dessert), rolled inside turon (banana spring rolls), served as langka con yelo (with ice and milk), and made into preserves, jams, and ice cream. The sweet aroma of ripe langka is unmistakable in Philippine wet markets and roadside fruit stalls.

Young, unripe langka — called "green jackfruit" — is where the tree truly shines as a staple food. When cooked, the young flesh has a fibrous, shredded texture remarkably similar to pulled pork or chicken. In the Philippines, it is most famously prepared as ginataang langka — simmered in coconut milk with shrimp paste, chili, and aromatics until tender. It is also used in sinigang, pinakbet, and kare-kare as a vegetable component. The global plant-based food movement has embraced young jackfruit as one of the best natural meat substitutes, with Filipino-style preparations gaining international recognition.

Langka seeds are another underutilized food source. Boiled or roasted, they have a starchy, chestnut-like flavor and are commonly eaten as a snack in the Visayas and Mindanao. They can also be ground into flour for baking.

Nutritional Highlights

Harvest time: 3 to 6 months after flowering for ripe fruit; young fruit can be harvested at any stage for cooking as a vegetable.

Storage: Ripe langka arils can be refrigerated for 5 to 7 days or frozen for up to 6 months. Whole uncut ripe fruit keeps 3 to 5 days at room temperature. Young langka for cooking keeps 1 to 2 weeks in the refrigerator. Seeds should be boiled or roasted within 2 days of extraction for best results.

Air Quality and Oxygen Production

Langka is an excellent oxygen producer and carbon sequester due to its large size, dense canopy of broad evergreen leaves, and year-round photosynthetic activity. A single mature langka tree with a full canopy of 6 to 10 meters in diameter provides significant carbon dioxide absorption and oxygen output. The tree's evergreen nature means it does not experience seasonal leaf drop in the Philippine tropical climate, maintaining continuous gas exchange throughout the year.

CO₂ absorption: High

Beyond direct oxygen production, langka trees provide valuable urban ecosystem services in Philippine communities. Their large, dense canopy creates substantial shade that can reduce surrounding air temperatures by 2 to 5 degrees Celsius, helping mitigate the urban heat island effect in densely built Filipino neighborhoods. The tree is commonly planted along streets and in public parks across Philippine cities and municipalities as both a shade tree and a productive fruit source for the community.

Toxicity and Safety

Humans: Non-toxic (all edible parts when properly prepared)

Pets: Non-toxic — safe around cats and dogs

Langka fruit is non-toxic and safe for human consumption in all its edible forms — ripe arils, young fruit, and cooked seeds. However, there are a few practical safety considerations. The seeds contain trypsin inhibitors and should not be eaten raw; they must be boiled or roasted before consumption. The white latex sap that oozes from the fruit's skin and core can irritate the skin and is very sticky — Filipino cooks traditionally coat their hands and knife with cooking oil before cutting langka to prevent the latex from adhering. Some individuals with birch pollen allergies or latex allergies may experience cross-reactive allergic reactions to langka. The ripe fruit is high in natural sugars and should be consumed in moderation by people with diabetes.

Common Pests and Diseases in the Philippines

Pests

• Fruit flies (Bactrocera spp.) — the most damaging pest of langka in the Philippines. Female flies lay eggs in ripening fruit, and larvae feed inside, causing rot. Control by bagging developing fruits with paper or plastic bags, using methyl eugenol traps, or harvesting fruit slightly early and ripening off the tree.
• Shoot borers — caterpillars that bore into young shoots and developing flower clusters, causing dieback. Prune and destroy affected shoots. Apply neem-based insecticide during flowering season if infestation is heavy.
• Mealybugs — white, cottony insects that cluster on fruit stems and branch junctions, sucking sap and secreting honeydew. Spray with neem oil or insecticidal soap. Encourage natural predators like ladybugs.

Diseases

• Rhizopus fruit rot — the most common disease affecting harvested langka in the Philippines, especially during the wet season. Caused by the fungus Rhizopus stolonifer, it creates soft, dark, watery spots on ripe fruit. Prevent by harvesting before full ripeness, handling fruit carefully to avoid wounds, and storing in a cool, dry place.
• Pink disease (Corticium salmonicolor) — a fungal infection that attacks branches, causing pinkish-white encrustation on bark and eventual branch dieback. Prune affected branches 30 cm below visible infection and apply copper fungicide to cut surfaces.