Arachis hypogaea, commonly known as the groundnut or peanut, is a flowering legume native to South America that has long been cultivated across South and Southeast Asia, including Sri Lanka. Beyond its widespread use as a food crop, it holds a recognised place in the catalog of ayurvedic medicinal plants documented on the island, where traditional practitioners have drawn on its nutritional and therapeutic properties for generations.
What is Arachis hypogaea and where does it grow in Sri Lanka?
Belonging to the family Fabaceae, Arachis hypogaea is an annual herb that grows close to the ground. Its most distinctive trait is geocarpy — after flowering above soil, the developing seed pods push themselves underground to mature. The plant thrives in warm, well-drained sandy loam soils and is cultivated in the dry and intermediate zones of Sri Lanka, particularly in the North Central, Northern, and Eastern provinces. It is grown both as a subsistence crop and for commercial oil production.
- Common names: Groundnut, Peanut (English); Kadala (Sinhala: කඩල); Nilakkadala (Tamil: நிலக்கடலை)
- Family: Fabaceae (Leguminosae)
- Growth habit: Annual, low-growing herb, 30–50 cm tall
- Soil preference: Sandy loam, well-drained, slightly acidic
- Fruiting cycle: Typically 90–120 days from sowing to harvest
What are the ayurvedic and traditional medicinal uses of Arachis hypogaea?
In Sri Lankan and broader South Asian ayurvedic tradition, different parts of the groundnut plant are attributed with distinct properties. The seeds are considered nutritive and energy-giving, used to support recovery from debility and to promote weight gain in underweight individuals. Groundnut oil is applied topically in some traditional formulations to moisturise skin and ease joint discomfort.
Practitioners of traditional medicine note the following attributed actions:
- Seeds: Nutritive (brimhana), aphrodisiac (vajikarana), and galactagogue properties are referenced in Ayurvedic texts.
- Oil: Used as a base carrier oil in medicated oil preparations (taila); considered unctuous (snigdha) and warming (ushna) in character.
- Leaves and stems: Occasionally used in poultices in folk medicine, though this is less formally documented.
As with other plants in Sri Lanka's ayurvedic catalog — such as Acacia chundra and Pongamia pinnata — Arachis hypogaea is understood within the framework of tridosha balance, with its warm and oily qualities making it relevant primarily to vata-related imbalances.
What is the nutritional profile of the groundnut?
Arachis hypogaea seeds are among the most calorie-dense plant foods available. They are rich in monounsaturated and polyunsaturated fats, high-quality protein, dietary fibre, and an array of micronutrients. This nutritional density underpins many of its traditional uses as a restorative food.
| Nutrient | Approximate content per 100 g (raw seeds) |
|---|---|
| Energy | 567 kcal |
| Protein | 25–28 g |
| Total fat | 49–51 g |
| Carbohydrates | 16–18 g |
| Dietary fibre | 8–9 g |
| Niacin (B3) | 12–14 mg |
| Folate | 240–250 µg |
| Magnesium | 165–170 mg |
Groundnut oil, pressed from the seeds, is widely used in Sri Lankan cooking and is valued in traditional medicine as a massage and preparation oil for its stability at moderate temperatures and its mild, neutral character.
How does Arachis hypogaea fit into Sri Lanka's broader medicinal plant tradition?
Sri Lanka's ayurvedic heritage is among the oldest unbroken traditions of plant-based medicine in the world, with records traceable to ancient Sinhalese kingdoms. The island's diverse ecosystems — from coastal lowlands to montane forests — support an extraordinary range of medicinal species, many of which remain in active use by registered ayurvedic physicians operating under the Ministry of Indigenous Medicine.
Arachis hypogaea sits within this tradition primarily as a nutritive and restorative plant rather than a primary therapeutic herb. It is more commonly encountered in compound formulations and dietary recommendations than as a standalone medicinal ingredient. Related formulations documented in the Sri Lankan pharmacopoeia include preparations such as Yogaraja Guggulu and Pushyanuga Churna, which illustrate the compound approach characteristic of classical Ayurveda.
Are there any cautions or contraindications associated with groundnut in traditional medicine?
Traditional ayurvedic guidance generally considers Arachis hypogaea unsuitable in large quantities for individuals with a dominant kapha constitution or those with conditions associated with excess mucus and heaviness. Its high fat content means it is recommended in moderation for those with sluggish digestion. Modern clinical awareness also recognises that groundnut is among the more common food allergens globally; individuals with known legume sensitivities should consult a physician before using it therapeutically. It is important to note that traditional uses described here are historical and ethnobotanical in nature and should not substitute for professional medical advice.
Where can travellers encounter Sri Lanka's ayurvedic plant traditions?
Visitors to Sri Lanka with an interest in traditional medicine will find opportunities to engage with living ayurvedic practice throughout the country. Ayurvedic centres and herbal gardens operate in many destinations, and guided village experiences in rural areas — particularly in the cultural heartland of the North Central Province — often include introductions to kitchen and medicinal gardens where plants like groundnut, coconut (Cocos nucifera), cloves (Syzygium aromaticum), and Ceylon black pepper are cultivated alongside one another.
The Sinharaja Forest Reserve, a UNESCO World Heritage Site in the wet zone, and the forests of the central highlands shelter many endemic medicinal species that continue to be studied by ethnobotanists. Several eco-lodges and heritage properties offer guided walks that contextualise Sri Lanka's plant biodiversity within both ecological and traditional medicinal frameworks.
