Wansoy (Coriandrum sativum)

About Wansoy

Wansoy (Coriandrum sativum), known internationally as cilantro (leaves) and coriander (seeds), is the bright, citrusy herb that has become increasingly prominent in Filipino cooking as Thai, Vietnamese, and modern fusion cuisines reshape the Philippine food landscape. Once primarily found in Chinese-Filipino recipes and Mindanao Maranao cooking, wansoy now appears in Manila restaurant sisig, upscale kinilaw, weekend market pho, and home-cooked Thai green curries adapted to Filipino taste.

The plant is a fast-growing, short-lived annual that races through its life cycle with urgency — especially in tropical heat. From a cluster of rounded, lobed basal leaves (the cilantro stage), it quickly shoots up a slender, branching flower stalk adorned with feathery, finely divided upper leaves (which taste different from the basal leaves — more delicate and less pungent). Small white or pale pink flowers produce round seeds that dry into the familiar coriander spice. The entire journey from seed to seed can take as little as 8-12 weeks in the Philippines, and the harvestable leaf window may be only 3-5 weeks.

Wansoy's most famous characteristic is the polarizing taste reaction it produces. For roughly 4-14% of the population, cilantro tastes distinctly "soapy" — a genetically determined perception linked to olfactory receptor gene OR6A2 that heightens sensitivity to specific aldehydes in the leaves. For the majority, cilantro's flavor is bright, citrusy, and addictive. This genetic divide makes wansoy the most controversial herb in any kitchen.

For Filipino urban growers, wansoy is easy to start but challenging to sustain — heat and long tropical days trigger rapid bolting (flowering), cutting the leaf harvest short. The key strategies are partial shade, consistent moisture, succession planting every 2-3 weeks, and growing during the cooler months. The reward is intensely fresh cilantro that is vastly superior to the often-wilted bunches found in palengke herb sections.

History & Discovery

Coriandrum sativum is native to the Mediterranean region and southwestern Asia — from southern Europe through the Middle East to Central Asia. It is one of the oldest herbs in recorded history: coriander seeds were found in the tomb of Pharaoh Tutankhamun (1323 BCE), mentioned in the Sanskrit text Rigveda (1500 BCE), and referenced in the Old Testament Book of Exodus, where manna is compared to coriander seed. The genus name Coriandrum derives from the Greek "koris" (bedbug), reportedly because the ancient Greeks thought the leaves smelled like crushed bedbugs — an early documentation of the love-it-or-hate-it flavor response.

Coriander spread eastward through the spice trade routes — reaching China, India, and Southeast Asia centuries ago. In Chinese cuisine, the herb is called "xiāngcài" (香菜, fragrant vegetable), and the Filipino name "wansoy" derives from the Hokkien Chinese "iân-sui" (芫荽), reflecting the same Chinese merchant communities that brought kintsay, pancit, and lumpia to the Philippines. In Mindanao, coriander seeds have been used in Maranao and Tausug cooking for centuries — a connection to Arab and Indian Ocean trade networks that predates the Spanish colonial period.

The species name sativum means "cultivated" — like garlic (A. sativum), coriander has been grown by humans for so long that its exact wild origin is debated. Today, coriander is one of the most widely used herbs globally — essential in Mexican, Thai, Vietnamese, Indian, Middle Eastern, and increasingly Filipino cuisines. The Philippines is not a major producer, but wansoy cultivation has expanded as demand grows with the influence of regional Asian cuisines on Filipino food culture.

How to Plant Wansoy in the Philippines

Wansoy is grown from seed — and only from seed. It has a taproot system that resents transplanting, so always direct sow in the final container or garden bed. Seeds are inexpensive and widely available — even whole coriander from the spice section works.

Propagation Steps

1. Prepare seeds: Each coriander "seed" is actually a fruit containing two seeds. Gently crush seeds with a rolling pin or the flat of a knife to split them in half — this exposes both embryos and dramatically improves germination. Soak the split seeds in water for 12-24 hours before planting.
2. Choose containers: Use pots at least 15 cm deep (wansoy develops a taproot). Width of 20-25 cm supports 5-8 plants. Ensure drainage holes. Fill with rich, well-draining potting mix amended with compost. Wansoy does not transplant — sow directly in the final container.
3. Direct sow: Scatter prepared seeds 1-2 cm apart on the surface of moist potting mix. Cover with 1 cm of fine soil. Water gently with a fine-rose watering can — do not wash seeds away. Place in morning sun / afternoon shade location.
4. Germination: Seeds germinate in 7-14 days. Keep soil consistently moist during this period. Do not let the surface dry and crust — mist gently if needed. Germination is uneven — some seeds come up before others.
5. Thin seedlings: When seedlings are 5 cm tall, thin to 5-8 cm apart. Use the thinnings in cooking — baby wansoy leaves are tender and flavorful. Overcrowded plants bolt faster and produce fewer leaves.
6. Harvest before bolting: Begin harvesting outer leaves at 35-50 days when plants are 15-20 cm tall. Cut individual stalks from the outside, leaving the center to grow. Once the central stem begins to elongate and upper leaves become feathery (bolting), the leaf harvest window is closing. Let it flower for coriander seeds or self-seeding.

Best Planting Season

The cool dry season (November-February) produces the best wansoy in the Philippines — cooler temperatures delay bolting and extend the leaf harvest window to 4-6 weeks. Hot-season planting (March-May) is possible but the plant bolts rapidly, sometimes in just 3-4 weeks. Wet-season planting works if drainage is excellent. For year-round supply, succession plant every 2-3 weeks — as one batch bolts, the next is ready for harvest.

Care Guide

Sunlight

Partial shade is critical in the Philippines — 3-5 hours of morning sun with afternoon shade is ideal. Full tropical sun causes rapid bolting within weeks. However, deep shade produces leggy, flavorless plants. The balance point is morning light for flavor development with protection from intense afternoon heat. East-facing balconies, under tree canopies with dappled light, or behind taller companion plants are good positions.

Water

Keep soil consistently moist but not waterlogged. Water daily in hot weather, every other day during cooler months. Drought stress is the second-fastest bolting trigger after heat. Mulching with coconut coir or fine compost helps maintain moisture and keep roots cool. Container plants dry out quickly in Philippine heat — check moisture daily. Avoid wetting the leaves when watering to reduce fungal disease risk.

Soil

Rich, well-draining soil with good organic matter content. Optimal pH is 6.2-6.8. Mix garden soil with compost and a small amount of sand or perlite for drainage. The soil should hold moisture without becoming soggy — a balance between the water retention of compost and the drainage of sand. Wansoy's taproot needs at least 15 cm of uncompacted soil depth.

Humidity & Temperature

Wansoy prefers cool conditions (15-25°C) — Philippine lowland temperatures (28-34°C) are significantly above its comfort zone, which explains the rapid bolting issue. High humidity (70-85%) is tolerated but increases fungal disease risk. The herb performs dramatically better during the Philippine cool season. In hot months, every cooling strategy helps: shade, mulching, misting, and elevated, breezy positions. Highland areas (Benguet, Bukidnon) produce the best commercial wansoy.

Fertilizer

Light feeding only — wansoy does not need heavy fertilization. Apply a light dose of balanced liquid fertilizer (or compost tea) every 2-3 weeks. Excessive nitrogen promotes fast, soft growth that bolts even faster. The compost mixed in at planting provides most of what the plant needs during its short life cycle. Organic approaches (compost, worm castings) are ideal.

Succession Planting

The most important strategy for continuous wansoy supply in the Philippines. Sow a new batch of seeds every 2-3 weeks — by the time one batch bolts, the next is entering its harvest window. Maintain 3-4 pots in rotation: one just germinated, one in active leaf harvest, one bolting/seeding. This relay system ensures you never run out of fresh wansoy despite each plant's short leaf production phase.

Growing Medium Options

Edible Uses & Nutrition

Wansoy provides two distinct culinary products from the same plant: fresh cilantro leaves (bright, citrusy, polarizing) and dried coriander seeds (warm, nutty, universally enjoyed). The leaves are always used raw or added at the very end of cooking to preserve their volatile essential oils.

Edible Parts

• Basal leaves (primary): The rounded, lobed lower leaves — the "cilantro" used as herb and garnish
• Upper leaves: Feathery, finely divided leaves on the flower stalk — milder flavor, used as garnish
• Stems: Flavorful — chopped and used in cooking, pastes, and marinades (not just the leaves)
• Seeds: Dried mature seeds — the "coriander" spice, used whole or ground
• Roots: Intensely aromatic — used in Thai curry pastes and some Southeast Asian dishes

Culinary Uses in Filipino Cooking

• Kinilaw: Fresh wansoy mixed into raw fish or seafood salad with vinegar, calamansi, onion, ginger, and chili — the cilantro adds a bright counterpoint to the acid-cured seafood.
• Modern sisig: Chopped wansoy as a fresh garnish on updated sisig variations — adding color and citrusy aroma to the rich, crispy pork dish.
• Thai-inspired Filipino dishes: The growing popularity of Thai food in the Philippines has made wansoy essential for home-cooked tom yum, green curry, and pad Thai adaptations.
• Vietnamese-style pho/bún: Manila's expanding Vietnamese food scene uses generous wansoy as a fresh herb accompaniment alongside bean sprouts and basil.
• Fresh lumpia: Wansoy added to the herb and vegetable filling for a modern twist on traditional fresh spring rolls.
• Sawsawan variations: Chopped wansoy in vinegar-based dipping sauces — particularly with grilled seafood.
• Mindanao spice blends: Ground coriander seeds used in Maranao and Tausug meat preparations, reflecting Islamic culinary traditions.

Nutritional Information

Per 100 g of fresh cilantro leaves (USDA FoodData Central):

Wansoy leaves are a nutritional powerhouse relative to their weight — extraordinarily rich in vitamin K (258% DV per 100 g), vitamin A (135% DV), and vitamin C (30% DV). While consumed in smaller garnish quantities per serving, regular use contributes meaningful micronutrients. The herb's bioactive compounds include linalool and geranyl acetate (in seeds) with documented antioxidant and antimicrobial properties. The aldehydes responsible for cilantro's distinctive flavor (and the soapy perception in some) also have documented chelating properties — the ability to bind certain heavy metals.

Air Quality & Oxygen

As a small, short-lived annual herb, wansoy's contribution to air quality is minimal on an individual plant basis. Its value for urban environments lies in the biodiversity it supports during its flowering phase — wansoy flowers are excellent nectar sources for small beneficial insects, hoverflies, and parasitic wasps that provide natural pest control in urban gardens. Letting some wansoy plants flower supports pollinator diversity on balconies and rooftops.

A succession of wansoy pots on a balcony adds continuous living greenery and aromatic fragrance to urban spaces — a quality-of-life benefit that goes beyond strict air quality metrics.

Toxicity & Safety

Humans: Wansoy is non-toxic and has an extensive global safety record. The genetic "soapy taste" response affects 4-14% of the population but is not a toxicity issue — it is a harmless perceptual difference. People with allergy to other Apiaceae family plants (celery, carrot, parsley) may have cross-sensitivity to cilantro, though true cilantro allergy is rare. Contact dermatitis from handling the plant occurs in a small number of sensitive individuals. Normal culinary consumption is safe for all ages, including pregnant women and children.

Pets: Cilantro/coriander is not listed as toxic to dogs or cats by the ASPCA. Small amounts of fresh cilantro are safe for dogs and some pet owners add it to dog food as a nutritional supplement. The plant is safe to grow around pets, though the strong aroma means most animals avoid it.

Common Pests & Diseases in the Philippines

• Aphids: The most common wansoy pest — cluster on young leaves and flower buds. Control with neem oil spray or strong water jets. Inspect regularly, especially in sheltered growing positions where natural predators may be absent.
• Leaf spot (Alternaria spp.): Brown-black spots on leaves during humid conditions. Remove affected leaves, improve air circulation, and avoid overhead watering. Space plants adequately to reduce humidity around foliage.
• Powdery mildew: White fungal coating on leaves during the transition between wet and dry seasons. Improve airflow and avoid overcrowding. Potassium bicarbonate spray helps control mild infections.
• Whiteflies: Small white flying insects on leaf undersides. Produce honeydew that attracts sooty mold. Yellow sticky traps and neem oil spray control populations.
• Damping-off: Fungal disease that kills seedlings at soil level — stems collapse at the base. Caused by overwatering, poor drainage, and overcrowded sowing. Use clean containers, well-draining mix, and avoid saturating the soil surface.
• Bacterial leaf spot: Water-soaked spots that turn brown, especially during warm, humid weather. Avoid wetting foliage when watering. Remove and destroy affected plants. Practice crop rotation.

Frequently Asked Questions

Sources

• Plants of the World Online — Coriandrum sativum L. Royal Botanic Gardens, Kew.
• USDA FoodData Central — Coriander (cilantro) leaves, raw. FDC ID: 169997.
• FNRI-DOST — Philippine Food Composition Tables: Wansoy nutritional data.
• Eriksson, N. et al. (2012). A genetic variant near olfactory receptor genes influences cilantro preference. Flavour, 1, 22.
• Laribi, B. et al. (2015). Coriander and its bioactive constituents. Fitoterapia, 103, 9-26.
• East-West Seed Philippines — Herb Production Guide.

This guide is for informational purposes. Consult local agricultural extension offices (ATI, DA-RFO) for region-specific growing recommendations.