Lanzones Lansium parasiticum

About Lanzones

Lanzones, scientifically known as Lansium parasiticum, is a tropical fruit tree belonging to the family Meliaceae (mahogany family). In the Philippines, it is one of the most eagerly anticipated seasonal fruits, with the arrival of lanzones in wet markets signaling the start of the "ber months" and the approaching holiday season. The fruit grows in grape-like clusters along the branches, each individual fruit roughly the size of a golf ball, encased in a thin yellowish-brown skin that peels away to reveal five translucent white segments of sweet, juicy flesh.

The tree itself is a medium to large evergreen that can reach 10 to 15 meters in height when mature, with a dense, spreading canopy of dark green pinnate leaves. Lanzones trees are slow-growing and long-lived, with some productive specimens in Laguna and Camiguin estimated to be over 100 years old. The trunk is straight with a greyish-brown bark that exudes a milky white latex when cut — a characteristic shared by many members of the Meliaceae family.

Two primary varieties dominate Philippine markets: the "duko" (or duku) type, which has thicker skin, smaller fruit, and noticeable latex that stains hands during peeling; and the "longkong" variety, which produces larger, rounder fruit with thinner skin and virtually no latex. Longkong is generally considered the superior eating variety and commands premium prices, though the traditional Philippine duko has its own loyal following for its slightly more complex sweet-tart flavor profile.

The short fruiting season — typically only September through November — combined with the tree's alternate bearing habit (producing heavy crops only every other year) makes lanzones a seasonal luxury rather than a year-round staple. This scarcity is precisely what has elevated it to festival status in Philippine culture, most famously through the annual Camiguin Lanzones Festival celebrated every October.

History and Discovery

Lansium parasiticum was first formally described by the Italian botanist Filippo Parlatore in the mid-19th century, though the tree had been cultivated across Southeast Asia for centuries before its scientific classification. The genus name Lansium is derived from the Malay word "lanseh" or "langsat," one of the many local names for the fruit across the Malay Archipelago. The species name parasiticum refers not to any parasitic habit of the tree, but rather to an early botanical misunderstanding that has since been corrected — the tree is fully autotrophic.

Lanzones is believed to have originated in the western Malay Peninsula and was distributed throughout Southeast Asia by early Austronesian traders. In the Philippines, lanzones cultivation has deep historical roots, with the provinces of Laguna, Camiguin, and parts of Mindanao being particularly renowned for their superior fruit quality. The Camiguin Lanzones Festival, established in 1979, has become one of the most recognized agricultural festivals in the country, drawing thousands of visitors each October to celebrate the island's bountiful harvest.

Filipino folklore contains several legends about the origin of lanzones. The most popular tells of a beautiful maiden whose bitter tears transformed a poisonous tree into the sweet-fruited lanzones we know today. Whether rooted in myth or agricultural history, lanzones has been a treasured part of Philippine food culture for generations, with families marking the season by gathering to peel and eat the fruit together, accepting the sticky latex stains on their hands as a small price for the sweet reward within.

How to Plant Lanzones

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

Germination time: 10 to 15 days from fresh seed (viability drops rapidly)

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. Choose between fresh seeds from ripe lanzones fruit or, ideally, obtain a marcotted or grafted seedling from a reliable nursery or DENR-accredited grower. Marcotted trees fruit in 5 to 8 years compared to 15 to 20 years from seed — this difference is enormous and makes vegetative propagation the only practical choice for most growers.
2. Prepare the planting site. Select a partially shaded location, as young lanzones trees are shade-tolerant and actually perform poorly in full, direct sunlight during their first 2 to 3 years. The site should have deep, rich, well-drained loamy soil. If planting in clay-heavy Philippine soils, amend generously with compost and rice hull ash to improve drainage and aeration.
3. Plant the seedling or seed. Dig a hole 50 cm wide and 50 cm deep. Mix the excavated soil with well-aged compost and animal manure in a 2:1:1 ratio. Plant the seedling at the same depth it was growing in the nursery bag. If planting seeds, sow them 2 cm deep immediately after extracting from the fruit — lanzones seeds are recalcitrant and lose viability within days of removal from the flesh.
4. Provide shade and water. Install temporary shade cloth (50% shade) or position the young tree under an existing canopy of taller trees for the first 2 to 3 years. Water deeply twice a week during dry months, ensuring the root zone stays consistently moist. Mulch heavily with dried leaves or coconut coir to retain soil moisture.
5. Fertilize and maintain. Apply complete fertilizer (14-14-14) quarterly during the first 5 years, increasing the amount as the tree grows. Once the tree begins fruiting, switch to a potassium-rich formula (e.g., 10-10-20) to support fruit development. Maintain a weed-free zone of at least 1 meter radius around the trunk.
6. Wait for fruiting and harvest. This is where patience becomes critical. Lanzones trees are among the slowest fruit trees to bear — 15 to 20 years from seed, or 5 to 8 years from marcotted/grafted stock. When clusters turn yellowish-brown and the skin peels easily without excessive latex flow, the fruit is ready for harvest. The season is short — typically only 6 to 8 weeks between September and November.

Care Guide

Sunlight

Requirement: Partial Shade (young) to Full Sun (mature)

Young lanzones trees (under 3 years) are shade-tolerant and actually prefer filtered light. They naturally grow as understory trees in tropical forests and can suffer leaf scorch under intense direct sun during their juvenile phase. Mature trees, however, produce best when they receive full sun of 6 to 8 hours daily. In the Philippine context, this means planting young trees near larger shade trees or structures, then gradually exposing them to more light as they grow and their canopy develops.

Water

Frequency: 2 to 3 times per week during dry season

Lanzones requires consistent moisture, especially during the flowering and fruit development stages (typically July to September in the Philippines). Water deeply rather than frequently — the root system extends deep into the soil and benefits from thorough soaking rather than surface sprinkling. During the rainy season, natural rainfall is usually sufficient. Reduce watering slightly after harvest to allow the tree a brief rest period before the next flowering cycle.

Soil

Type: Rich Loam, Clay-Loam

pH Range: 5.5 to 6.5

Lanzones thrives in deep, fertile, well-drained soils rich in organic matter. It prefers slightly acidic conditions typical of Philippine volcanic soils found in Laguna, Batangas, and Camiguin. The tree does not tolerate waterlogging — while it likes consistent moisture, standing water around the roots will cause root rot. In heavy clay soils common in parts of Central Luzon, incorporate generous amounts of organic compost and rice hull ash to improve drainage while retaining adequate moisture.

Humidity and Temperature

Humidity: 70 to 85%

Temperature: 25°C to 35°C

Lanzones is a true tropical species that requires warm, humid conditions year-round. It does not tolerate temperatures below 15°C and cannot survive frost. The high-humidity, warm-temperature climate of the Philippine lowlands (below 600 meters elevation) is ideal. The tree performs best in areas with distinct wet and dry seasons, as the brief dry period helps trigger flowering. Purely wet climates (such as Type II rainfall areas in eastern Philippines) may result in poor fruit set.

Fertilizer

Apply balanced fertilizer (14-14-14) at a rate of 200 grams per year of tree age, split into quarterly applications during the growing season. For bearing trees, shift to a high-potassium formula (0-0-60 muriate of potash or 10-10-20 complete) during the fruiting months to improve fruit size and sweetness. Supplement with foliar sprays of calcium and boron during flowering to prevent fruit drop. Organic growers can use aged chicken manure and wood ash as potassium-rich alternatives.

Pruning

Lanzones requires minimal pruning compared to other fruit trees. Remove dead, diseased, or crossing branches annually after the harvest season. Light thinning of the interior canopy improves air circulation and light penetration, which helps reduce fungal disease pressure during the wet season. Avoid heavy pruning, as lanzones recovers slowly and excessive cutting can delay fruiting by one to two seasons. Water sprouts (suckers growing straight up from main branches) should be removed promptly.

Growing Medium Options

Lanzones is exclusively a soil-grown tree due to its large mature size (10 to 15 meters), extensive root system, and extremely long juvenile period before fruiting. Neither passive water culture nor active hydroponic systems are practical for this species. The tree requires the structural support of deep, well-drained soil to develop the root architecture necessary to sustain a large canopy and heavy fruit loads. Rich volcanic loam with high organic matter content, as found naturally in Laguna, Batangas, and Camiguin provinces, provides the ideal growing medium for Philippine lanzones production.

Edible Uses and Nutrition

Edible parts: Fruit flesh (arils)

Culinary Uses

Lanzones is primarily eaten fresh as a dessert fruit. To eat, simply peel away the thin yellowish-brown skin to reveal five translucent white segments arranged like a miniature citrus fruit. The flesh is sweet to sweet-tart depending on variety and ripeness, with a distinctive floral fragrance. Most segments contain no seed, though one or two segments per fruit may have a flat, bitter green seed that should be separated and not bitten into. Lanzones is a popular Filipino merienda snack and a staple offering during fiestas and family gatherings throughout the harvest months of September to November.

Beyond fresh consumption, lanzones is occasionally made into preserves, syrups, and candied fruit in Laguna province. Some Filipino families prepare lanzones jam by simmering the flesh with sugar and calamansi juice. The fruit can also be frozen for later use in smoothies and shakes, though the delicate texture is best appreciated fresh. In rural areas, the dried skin is burned as a mosquito repellent — a traditional practice that produces an aromatic smoke said to be effective against dengue-carrying mosquitoes.

Nutritional Highlights

Harvest time: September to November (peak in October). Trees exhibit alternate bearing, producing heavy crops every other year.

Storage: Fresh lanzones is highly perishable and lasts only 3 to 5 days at room temperature. Refrigeration extends shelf life to about one week. The fruit does not ripen further after picking, so harvest only when fully mature. Market price ranges from 80 to 200 pesos per kilogram depending on variety, source, and point in the season.

Air Quality and Oxygen Production

As a large evergreen tree with a dense, broad canopy, mature lanzones trees make a meaningful contribution to local air quality in Philippine communities. The extensive leaf surface area of a fully grown specimen provides significant carbon dioxide absorption and oxygen output year-round, as the tree retains its leaves even outside the fruiting season. In barangays across Laguna and Camiguin where lanzones orchards are prevalent, the tree canopy creates a measurably cooler, cleaner microclimate beneath.

CO₂ absorption: Moderate to High (large canopy, slow growth rate)

While lanzones does not match the carbon sequestration rate of faster-growing trees like malunggay or ipil-ipil, its longevity — productive trees can live well over 100 years — means that a single lanzones tree accumulates substantial carbon in its wood biomass over its lifetime. Planting lanzones as shade trees in urban parks and along residential streets provides both air quality benefits and the seasonal bonus of fresh fruit for the community.

Toxicity and Safety

Humans: Non-toxic

Pets: Non-toxic — safe around cats and dogs

Lanzones fruit flesh is completely non-toxic and safe for consumption by all ages, including young children and pregnant women. The seeds, while bitter-tasting, are not toxic but are not intended for consumption and should be discarded. The white latex sap present in the skin (particularly in the duko variety) is not toxic but can cause mild skin irritation in sensitive individuals and leaves stubborn sticky residue on hands that is difficult to wash off with water alone — cooking oil or coconut oil dissolves it effectively. The bark and leaves have been used in traditional Philippine herbal medicine as a fever reducer and for treatment of digestive ailments, though scientific validation of these folk uses remains limited.

Common Pests and Diseases in the Philippines

Pests

• Fruit fly (Bactrocera spp.) — the most serious pest of lanzones in the Philippines, laying eggs in ripening fruit. Control with protein bait traps and early harvest of mature fruit.
• Bark borer — larvae tunnel into the trunk and main branches, weakening the tree structure. Apply wound paint to cuts and remove heavily infested branches.
• Tussock moth caterpillars — defoliate branches during the wet season. Hand-pick or apply Bacillus thuringiensis (Bt) biological insecticide.

Diseases

• Phytophthora root rot — the most damaging disease, especially in poorly drained soils during extended wet periods. Prevention through proper drainage is the only effective control.
• Sooty mold — black fungal coating on leaves caused by honeydew excretions from sucking insects. Control the insect source (scale, mealybugs) to eliminate the problem.
• Anthracnose — fungal spots on fruit and leaves during humid conditions. Apply copper-based fungicide preventively during the fruiting season.