Akapulko Senna alata

About Akapulko

Akapulko, scientifically known as Senna alata (synonym Cassia alata), is a large, erect tropical shrub belonging to the family Fabaceae. Commonly called Ringworm Bush or Candle Bush in English, it is one of the most recognized medicinal plants in the Philippines — officially endorsed by the Department of Health (DOH) as one of the nation's 10 recommended herbal medicines. The plant is prized for its potent antifungal properties, specifically its effectiveness against dermatophyte fungi that cause ringworm (buni), tinea flava (an-an), and scabies (kurikong).

The shrub grows rapidly to heights of 2 to 4 meters, producing thick, woody stems and large compound leaves with 8 to 14 pairs of rounded, oblong leaflets. Its most striking feature is its flowers — bright golden-yellow blooms arranged in dense, upright spikes that resemble candles or candlesticks, giving rise to the English name Candle Bush. These flower spikes can reach 30 to 50 centimeters in length and bloom from October through February in the Philippines, making it an attractive ornamental even apart from its medicinal value.

In the Philippine context, Akapulko is a plant that practically grows itself. It thrives in neglected lots, along roadsides, in vacant land, and at forest margins throughout the archipelago from sea level to moderate elevations. Its medicinal reputation is deeply embedded in Filipino folk culture — generations of Filipinos have relied on fresh Akapulko leaf poultices as the first-line home remedy for common skin fungal infections, long before its efficacy was validated by modern pharmacological research.

History and Discovery

Senna alata was originally described by Carl Linnaeus in 1753 under the name Cassia alata. The species was later transferred to the genus Senna following taxonomic revisions, though many references still use the older Cassia name. The species epithet alata comes from the Latin word for "winged," referring to the conspicuous winged rachis (central leaf stalk) of the compound leaves.

The plant is native to tropical regions of the Americas, likely originating in Mexico and Central America. Spanish colonizers introduced it to the Philippines during the galleon trade era of the 16th to 18th centuries, along with numerous other New World plants. In the Philippines, it naturalized rapidly and spread throughout the islands, establishing itself so thoroughly that many Filipinos consider it a native plant. The Filipino name "akapulko" is believed to derive from "Acapulco," the Mexican port city that served as the western terminus of the Manila-Acapulco galleon trade route.

Traditional use of Akapulko for skin diseases was documented by Filipino herbolarios (traditional healers) as early as the Spanish colonial period. In 1997, the Philippine government formally recognized its medicinal value through Republic Act 8423, the Traditional and Alternative Medicine Act, which established the 10 medicinal plants program. Scientific studies conducted at Philippine universities, particularly UP Manila and UST, confirmed the antifungal activity of Akapulko leaf extracts against Trichophyton and Microsporum species, the fungi responsible for most ringworm infections in tropical climates.

How to Plant Akapulko

Propagation methods: Seed (primary method)

Germination time: 7 to 14 days (with scarification)

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

Step-by-Step Planting Guide

1. Collect seeds from mature pods. Harvest seeds from the long, flat seed pods that turn dark brown and begin splitting open on the plant. Each pod contains numerous flat, disc-shaped seeds. Choose plump, undamaged seeds for best germination. Seeds can also be collected from the ground beneath mature plants.
2. Scarify and soak the seeds. Akapulko seeds have a very hard seed coat that prevents water absorption. Nick the edge of each seed with a file, sandpaper, or nail clipper, then soak in warm water for 24 hours. Without this treatment, germination may take several weeks or fail entirely.
3. Prepare the planting site. Select a location with full sun exposure. Akapulko is extremely tolerant of poor soil — it grows in sandy, rocky, clayish, or loamy ground without amendment. The only requirement is reasonable drainage. Space planting holes at least 2 to 3 meters apart, as each plant will grow into a large, spreading shrub.
4. Sow seeds directly into the ground. Plant each seed 2 cm deep and cover lightly with soil. Water gently. Alternatively, start seeds in small pots filled with any garden soil and transplant seedlings to their permanent location when they reach 30 cm in height. Direct sowing is simpler and equally effective for this hardy species.
5. Water during the establishment phase. Water every two to three days for the first three to four weeks while roots develop. Once the seedling is actively growing and producing new leaves, it can generally survive on rainfall alone in Philippine conditions. Supplemental watering is only needed during extreme dry spells.
6. Manage the plant's vigorous growth. Akapulko grows extremely fast — expect 1 to 2 meters of growth in the first year. Prune annually during the dry season to maintain a manageable shape. Remove seed pods before they fully dry and split if you want to prevent aggressive self-seeding throughout your garden.

Care Guide

Sunlight

Requirement: Full Sun

Akapulko performs best in full sun with 6 to 8 hours of direct sunlight daily. In the wild, it colonizes open areas, roadsides, and forest clearings where sunlight is abundant. It can tolerate light partial shade but will grow leggy and produce fewer flowers. For maximum leaf production for medicinal harvest, plant in the sunniest available location in your garden.

Water

Frequency: Once per week or natural rainfall

Once established, Akapulko is remarkably drought-tolerant and typically requires no supplemental watering in Philippine conditions outside of prolonged dry spells. During the dry season (March to May), watering once a week is sufficient to keep the plant healthy and producing new leaves. Overwatering is unnecessary and can promote root diseases in heavy soil.

Soil

Type: Any — sandy, loam, clay, rocky

pH Range: 5.5 to 7.5

Akapulko is one of the least soil-demanding plants in the Philippine medicinal garden. It grows vigorously in virtually any soil type — from the sandy coastal soils of Pangasinan to the heavy clay of Pampanga to the rocky limestone of Cebu. It even colonizes compacted, nutrient-poor soil along roadsides and in abandoned lots. No soil amendments or special preparation are needed for this hardy species.

Humidity and Temperature

Humidity: 50 to 90%

Temperature: 24°C to 38°C

Akapulko is perfectly suited to the Philippine climate. It thrives in the hot, humid conditions that prevail year-round across the archipelago. The plant has no cold tolerance and will be damaged by temperatures below 10°C, but this is irrelevant in lowland Philippine conditions. It grows continuously without dormancy in tropical environments, producing leaves and flowers throughout the year with peak flowering during the cool months of October through February.

Fertilizer

Akapulko generally requires no fertilizer in Philippine garden conditions. As a member of the Fabaceae (legume) family, it has nitrogen-fixing root nodules that allow it to thrive in nutrient-poor soils. If you want to encourage maximum growth and leaf production, a single application of balanced organic fertilizer or compost at the beginning of the rainy season is sufficient. Avoid heavy nitrogen fertilization, as the plant already produces nitrogen through its symbiotic root bacteria.

Pruning

Annual pruning is recommended to keep Akapulko at a manageable size for a home garden. Without pruning, it will grow to 3 to 4 meters tall and spread widely. Cut the main stems back to 1 to 1.5 meters during the dry season (February to March). The plant responds vigorously to pruning with abundant new growth. Remove dried seed pods throughout the year to prevent unwanted self-seeding. Hard pruning to near ground level is also well-tolerated — the plant will regrow rapidly from the base.

Growing Medium Options

Akapulko is exclusively a soil-grown plant. Its large mature size (2 to 4 meters), aggressive root system, and woody shrub growth habit make it completely impractical for hydroponic or water culture systems. It is best grown directly in the ground where it can spread its roots freely. Container growing is possible in very large pots (60+ cm diameter) for the first year or two, but the plant will eventually need to be transplanted to open ground for long-term health and productivity. For Philippine medicinal gardens, simply plant it in any available sunny patch of ground — no special growing medium or soil preparation is required.

Medicinal Uses and Preparation

DOH-approved indication: Skin fungal infections (antifungal — external use only)

Active compounds: Chrysophanol, aloe-emodin, rhein, and other anthraquinone glycosides

Traditional Preparations

The primary traditional preparation of Akapulko in the Philippines is the fresh leaf poultice. Mature leaves (not young, pale leaves) are harvested, washed, and pounded or crushed using a mortar and pestle or simply by hand until the yellow-green juice is released. This pulp is applied directly to the affected skin area and held in place with a clean cloth or bandage. The treatment is applied twice daily — morning and evening — for a minimum of 5 to 7 days or until the fungal infection clears.

Conditions Treated

• Buni (Ringworm / Tinea corporis) — circular, itchy patches on the body caused by dermatophyte fungi
• An-an (Tinea versicolor) — white or brown patches on the skin caused by the yeast Malassezia
• Kurikong / Galis-aso (Scabies) — intensely itchy skin condition caused by mites (adjunct treatment)
• Alipunga (Athlete's foot / Tinea pedis) — fungal infection between the toes

Preparation Method (DOH Guidelines)

1. Gather 5 to 7 fresh, mature Akapulko leaves.
2. Wash leaves thoroughly under running water.
3. Pound or crush leaves until juices are fully expressed.
4. Apply the crushed leaf and juice directly to the affected skin area.
5. Leave in place for 30 to 60 minutes, then rinse off with clean water.
6. Repeat twice daily for at least 7 days.

Air Quality and Oxygen Production

As a large, fast-growing shrub with abundant foliage, Akapulko contributes meaningfully to localized air quality improvement in urban and suburban Philippine environments. Its large compound leaves provide substantial surface area for photosynthesis and gas exchange. The plant grows actively year-round in tropical conditions, continuously absorbing carbon dioxide and releasing oxygen without the seasonal dormancy periods that limit temperate-zone plants.

CO2 absorption: Moderate to High

Akapulko is particularly valuable for air quality in neglected urban spaces — vacant lots, fence lines, and roadside areas — where few other plants thrive without care. Its ability to grow in poor, compacted soil and tolerate pollution makes it an excellent candidate for urban greening programs in Metro Manila and other Philippine cities. A row of Akapulko along a boundary fence provides both a medicinal resource and a living green barrier that filters particulate matter and produces oxygen.

Toxicity and Safety

Humans (External): Safe for topical skin application

Humans (Internal): TOXIC — do not ingest

Pets: Mildly toxic if ingested

Akapulko is safe and beneficial when used externally on the skin as directed. However, all parts of the plant — particularly the leaves and seeds — contain significant concentrations of anthraquinone compounds (chrysophanol, aloe-emodin, rhein) that act as powerful laxatives when ingested. Eating the leaves or drinking preparations made from them can cause severe abdominal cramping, watery diarrhea, nausea, and dehydration. In large doses, ingestion can lead to dangerous electrolyte imbalances.

Keep Akapulko away from areas where livestock or pets might browse on the foliage. While a small nibble is unlikely to cause serious harm, repeated ingestion by goats, dogs, or cats can lead to chronic gastrointestinal irritation. The plant's bitter taste generally deters animals from eating large quantities. For households with young children, plant Akapulko in a fenced area or at the back of the garden where it is accessible to adults for medicinal harvest but out of reach of curious toddlers.

Common Pests and Diseases in the Philippines

Pests

• Leaf-eating caterpillars — various moth larvae may feed on leaves during the wet season. Damage is typically cosmetic and the plant recovers quickly due to its fast growth. Hand-pick or apply Bacillus thuringiensis (Bt) for severe infestations.
• Aphids — occasionally cluster on young shoot tips. Control with a strong water spray or neem oil solution. Rarely causes significant damage to this robust plant.
• Seed weevils — small beetles that bore into developing seeds inside the pods. Does not affect the plant's health but reduces viable seed production.

Diseases

• Leaf spot — brown spots on older leaves caused by various fungal pathogens during extended rainy periods. Remove affected leaves and improve air circulation through pruning. Rarely serious.
• Root rot — only occurs in extremely waterlogged or poorly drained soils. Prevent by choosing a well-drained planting site. Unlikely in most Philippine garden conditions.

Overall, Akapulko is an extremely disease-resistant and pest-tolerant plant. Its anthraquinone compounds, which provide its medicinal value, also serve as natural chemical defenses that deter most insect herbivores. It is one of the most trouble-free plants to maintain in a Philippine garden.