Niyog-Niyogan Combretum indicum

About Niyog-Niyogan

Niyog-Niyogan, scientifically known as Combretum indicum (synonym Quisqualis indica), is a vigorous climbing vine belonging to the family Combretaceae. Known internationally as Rangoon Creeper, Chinese Honeysuckle, or Drunken Sailor, it is celebrated both for its stunning ornamental flowers and its DOH-approved medicinal use as an anthelmintic (deworming agent). The common Filipino name "Niyog-Niyogan" refers to the resemblance of its seeds to a miniature coconut (niyog).

The vine is a powerful climber capable of reaching 8 to 10 meters or more when given adequate support. It begins life as an erect shrub but quickly develops a climbing habit, using its old leaf petioles (which harden into hooked thorns) to grip and scramble over supports. The leaves are elliptical, 7 to 15 cm long, with a pointed tip and smooth margins. The vine produces dense clusters of tubular flowers in a spectacular color display — each flower opens white on its first evening, turns pink by the following day, and deepens to crimson red by the third day. Because flowers open sequentially over many days, a single cluster simultaneously displays all three colors, creating a breathtaking multi-hued effect.

What makes Niyog-Niyogan truly special in the Philippine context is its dual nature. It is both a practical medicinal plant — one of the DOH 10 recommended herbal medicines used to treat intestinal parasites in children — and a stunning ornamental vine that transforms fences, arbors, and pergolas into cascades of fragrant, color-changing blooms. This combination of beauty and utility makes it one of the most valuable plants a Filipino gardener can grow on their property.

History and Discovery

The plant was originally described by Carl Linnaeus in 1762 under the name Quisqualis indica. The curious genus name Quisqualis is Latin for "what is this?" — reportedly the exclamation of Georg Eberhard Rumphius, the pioneering Dutch-German botanist working in the Moluccas (now Maluku, Indonesia), who was uncertain whether the plant was a shrub or a vine because its growth habit changes dramatically as it matures. The species was later reclassified to Combretum indicum following molecular phylogenetic studies, though the older name Quisqualis indica remains widely used.

Niyog-Niyogan is native to tropical Asia, with a natural range spanning from India and Myanmar through mainland Southeast Asia, the Malay Archipelago, and the Philippines. It has been cultivated across the tropics for centuries as both an ornamental and medicinal plant. In the Philippines, the vine has been part of traditional folk medicine for generations — rural Filipino families have long used the dried seeds as a deworming remedy for children, typically administered with the evening meal.

The scientific validation of Niyog-Niyogan's anthelmintic properties was conducted by Philippine researchers under the DOST-NIRPROMP program, confirming its efficacy against common intestinal roundworms (Ascaris lumbricoides) and pinworms (Enterobius vermicularis). This research supported its inclusion in the DOH list of 10 recommended herbal medicines under Republic Act 8423. The active anthelmintic compounds identified include quisqualic acid and combretol, which paralyze intestinal worms and facilitate their expulsion from the body.

How to Plant Niyog-Niyogan

Propagation methods: Seed (preferred), Stem Cutting

Germination time: 2 to 4 weeks from seed

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

Step-by-Step Planting Guide

1. Collect seeds or prepare cuttings. Harvest mature seeds from dried fruit pods on an existing vine — the elongated, five-angled (sometimes five-winged) fruits turn brown when fully ripe and each contains a single seed shaped like a miniature coconut. Alternatively, take semi-hardwood stem cuttings 20 to 30 cm long from a vigorous, healthy vine. Seeds are the preferred propagation method as they produce plants with stronger root systems.
2. Prepare planting material. For seeds, soak in clean water overnight to soften the hard seed coat and accelerate germination. For cuttings, remove leaves from the lower half and allow the cut end to air-dry for a few hours in shade. Optionally apply rooting hormone to the cutting base, though Niyog-Niyogan cuttings root reasonably well without it.
3. Choose a site with strong support. This is critical — select a planting location at the base of a strong trellis, arbor, pergola, concrete fence, or steel framework capable of supporting significant weight. Niyog-Niyogan is a heavy, vigorous vine that can collapse lightweight bamboo structures. Space multiple plantings at least 3 to 4 meters apart along a fence line.
4. Plant in the ground. Plant seeds 2 cm deep in moist, well-drained soil enriched with compost. For cuttings, bury two-thirds of the length in soil packed firmly around the base. Position the planting within 30 cm of the support structure so the vine can begin climbing as soon as it develops its twining habit.
5. Water regularly during establishment. Water every 2 to 3 days for the first 2 months. Seeds germinate in 2 to 4 weeks. Cuttings root in 3 to 4 weeks. Once you observe vigorous new growth and the stems begin reaching for the support, the vine is successfully established and you can reduce watering frequency.
6. Train and prune. Guide young stems toward the support structure using soft garden ties. Once the vine is climbing independently, remove ties. Prune annually at the end of the dry season (February to March) to control spread, remove dead wood, and encourage new flowering growth. Without regular pruning, the vine will become an unmanageable tangle within 2 to 3 years.

Care Guide

Sunlight

Requirement: Full Sun

Niyog-Niyogan flowers most profusely in full sun with 6 to 8 hours of direct sunlight daily. It can tolerate partial shade but will produce significantly fewer flowers and grow more slowly. In the Philippine context, plant it on the south or west side of structures where it will receive maximum sun exposure. The vine itself can extend into shaded areas as it climbs, but the base and main flowering portions should be in direct sun for optimal bloom production.

Water

Frequency: 2 to 3 times per week (dry season); natural rainfall sufficient in wet season

Water established vines 2 to 3 times per week during the Philippine dry season (March to May) for best flowering. During the monsoon season from June to October, natural rainfall is typically more than adequate. Niyog-Niyogan is moderately drought-tolerant once established thanks to its deep, extensive root system, but consistent moisture during the flowering period produces more blooms and larger flower clusters. Avoid chronic waterlogging at the root zone, which can promote root diseases.

Soil

Type: Any — highly adaptable

pH Range: 5.5 to 7.5

Niyog-Niyogan is remarkably tolerant of various soil types. It grows vigorously in the full range of Philippine soils, from sandy coastal earth to heavy lowland clay, from acidic volcanic soil to limestone-derived alkaline soils. The vine performs best in fertile, well-drained loam enriched with organic matter, but it is vigorous enough to thrive even in poor, neglected soil. Adding compost at planting time and as an annual top-dressing supports maximum growth and flowering.

Humidity and Temperature

Humidity: 50 to 90%

Temperature: 22°C to 38°C

The Philippine tropical climate is ideal for Niyog-Niyogan. The vine thrives in warm, humid conditions and is not frost-tolerant — fortunately, frost is not a concern anywhere in the Philippine lowlands. It handles the full range of Philippine weather conditions, from the intense dry heat of April and May to the heavy rains and high humidity of the typhoon season. Strong winds from tropical storms can damage the vine, but it recovers rapidly from damage by producing vigorous new shoots.

Fertilizer

Feed Niyog-Niyogan with balanced fertilizer (14-14-14) or high-phosphorus fertilizer (to promote flowering) every 2 to 3 months during the growing season. Apply a generous layer of compost or aged manure around the base annually at the start of the rainy season. For maximum flowering, supplement with a bloom-boosting fertilizer high in phosphorus and potassium (such as 10-30-20) every month from May through August as buds begin forming.

Pruning

Annual pruning is essential to keep Niyog-Niyogan manageable and productive. Without it, the vine quickly becomes a dense, heavy mass that can collapse support structures and smother neighboring plants. Prune heavily at the end of the dry season (February to March), cutting back secondary growth to the main framework stems. Remove all dead, weak, and crossing branches. This hard annual pruning stimulates vigorous new growth that flowers on the current season's wood. During the growing season, trim wayward shoots monthly to maintain the desired shape and prevent the vine from invading areas where it is not wanted.

Growing Medium Options

Niyog-Niyogan is exclusively a ground-planted vine in practical cultivation. Its vigorous climbing habit, extensive root system, and potential size of 8 to 10 meters make it completely unsuitable for hydroponic systems, passive water culture, or even large containers in most situations. The vine needs to be planted directly in the ground at the base of a strong permanent support structure. For Philippine gardeners, this means choosing a spot along a concrete fence, steel trellis, sturdy arbor, or pergola where the vine can grow freely for years. Container growing is possible in a very large planter (at least 50 cm diameter) with a strong attached trellis, but results will be significantly less vigorous than ground planting.

Medicinal Uses and Preparation

Medicinal parts: Seeds (primary), Leaves (secondary, for skin conditions)

DOH-approved indication: Anthelmintic (deworming) — effective against roundworms and pinworms

Seed Preparation for Deworming

The primary medicinal use of Niyog-Niyogan is as a deworming agent using the dried mature seeds. Collect fully mature seeds from dried fruit pods. Remove the outer shell and dry the inner kernel (nut meat) thoroughly in the sun for 1 to 2 days, or roast lightly in a dry pan until slightly golden. The dried or roasted seeds are then administered orally according to the dosage guidelines below. Seeds should be chewed thoroughly or crushed and mixed with a small amount of honey, jam, or juice to make them more palatable for children.

Dosage Guidelines (DOH-recommended)

Treatment schedule: Administer once daily for 3 consecutive days. Take the seeds 2 hours after the last meal of the day (on a relatively empty stomach for best absorption). Do not eat anything else until the following morning.

Critical Dosage Warning

DO NOT exceed the recommended number of seeds. Overdose of Niyog-Niyogan seeds causes significant adverse effects including persistent hiccups (singultus — the most characteristic side effect of overdose), diarrhea, stomach cramps, nausea, and vomiting. While these effects are usually self-limiting and resolve within hours, they can be distressing, particularly for young children. The hiccups caused by Niyog-Niyogan overdose can persist for several hours and are resistant to normal hiccup remedies. If serious symptoms occur, seek medical attention.

Other Traditional Uses

Beyond the primary anthelmintic application, Niyog-Niyogan has additional traditional medicinal uses in the Philippines. A decoction of the leaves is used as a wash for skin parasites and boils. The fruit has been used in traditional preparations for diarrhea and fever. The flowers, while primarily ornamental, are sometimes used in folk remedies for headaches. However, only the deworming use of the seeds has received official DOH validation and recommendation.

Important disclaimer: Niyog-Niyogan seeds are used strictly as medicine, not as food. They should only be administered at the recommended dose for the specific purpose of deworming. Always consult a healthcare professional before administering any herbal deworming treatment to children. For severe or persistent worm infestations, conventional pharmaceutical dewormers prescribed by a physician may be more appropriate. Never give Niyog-Niyogan seeds to children under 4 years of age.

Air Quality and Oxygen Production

Niyog-Niyogan makes a significant contribution to air quality owing to its large total leaf biomass. A mature vine covering a 4 to 6 meter fence or pergola presents an enormous leaf surface area engaged in photosynthesis throughout the year. The vine maintains its leaves year-round in the Philippine tropical climate (it is evergreen in frost-free areas), providing continuous oxygen production and carbon dioxide absorption. Its dense foliage also functions as a physical filter, trapping dust and particulate matter from the surrounding air.

CO₂ absorption: High (due to large total leaf area)

Beyond gas exchange, Niyog-Niyogan provides important microclimate benefits in Philippine urban environments. When grown over arbors, pergolas, or along building walls, the dense vine canopy creates significant shade that can reduce ambient temperatures underneath by 3 to 5 degrees Celsius during the hot season. This natural cooling effect reduces energy consumption for air conditioning in nearby structures — an indirect but meaningful contribution to reducing carbon emissions in the Philippine urban context. The fragrant flowers also attract pollinators including moths, butterflies, and bees, supporting urban biodiversity.

Toxicity and Safety

Humans: Seeds are medicinal at proper dose; toxic effects at overdose

Pets: Seeds potentially harmful to dogs and cats — keep seeds away from pets

Niyog-Niyogan requires careful handling with respect to toxicity. The seeds contain the active compound quisqualic acid, which is a potent anthelmintic at therapeutic doses but can cause adverse neurological effects (persistent hiccups) and gastrointestinal distress (diarrhea, vomiting, abdominal pain) at higher doses. The seeds are NOT food and must only be used medicinally in the prescribed amounts.

The leaves, flowers, and stems of the vine are not considered toxic and are safe for casual contact — there is no risk from touching the plant, and the flowers can be handled and enjoyed without concern. Children should be supervised around fruiting vines to prevent them from consuming uncontrolled quantities of seeds. Dogs and cats should not be allowed to eat the seeds, as veterinary data on safe doses for animals is limited and the effects of quisqualic acid on pets are unpredictable.

Pregnant and breastfeeding women should not use Niyog-Niyogan seeds as a dewormer. Children under 4 years of age should not be given the seeds. If accidental overdose occurs, monitor for hiccups, vomiting, and diarrhea, maintain hydration, and seek medical attention if symptoms are severe or persist beyond 6 hours.

Common Pests and Diseases in the Philippines

Pests

• Aphids — small green or black insects that cluster on new growth tips and flower buds. Usually a dry-season problem. Control with a strong water spray or diluted neem oil. Natural predators (ladybugs) often control populations without intervention.
• Mealybugs — white cottony masses in dense foliage, particularly where air circulation is poor. Prune to improve airflow and treat with insecticidal soap or neem oil spray.
• Scale insects — brown or white bumps on older woody stems. Scrape off manually or apply horticultural oil. Rarely affect overall vine health.
• Caterpillars — occasional leaf-feeding caterpillars may defoliate small sections. Hand-pick or apply Bacillus thuringiensis (Bt) spray for heavy infestations.

Diseases

• Powdery mildew — white powdery coating on leaves during humid conditions with poor air circulation. Improve airflow through pruning, avoid overhead watering, and apply fungicide if severe.
• Leaf spot — brown or black spots during prolonged rainy periods. Remove affected leaves, improve air circulation, and ensure good drainage around the root zone.
• Root rot — possible in chronically waterlogged soil. Ensure adequate drainage at the planting site. This is uncommon in well-chosen locations.

Overall, Niyog-Niyogan is a robust and resilient vine that rarely suffers serious pest or disease problems in the Philippines. Its vigor means it typically outgrows minor damage faster than pests can inflict it. The most important maintenance practice is annual pruning to maintain good air circulation through the canopy, which prevents most fungal issues.