Black Gram (Urad Dal)
Vigna mungo
📖 About this plant
Black Gram (Vigna mungo), known as urad dal in Hindi, ulundu in Tamil, and black lentil (misleadingly — it is not a true lentil but a vigna bean), is an important annual pulse crop in the Fabaceae (legume) family, prized for its small black-skinned seeds with a creamy white interior. Native to the Indian subcontinent, where it has been cultivated for over 4,000 years, black gram is one of Indias most important pulse crops — India produces about 70% of the worlds supply, with major cultivation in Madhya Pradesh (the largest producer), Uttar Pradesh, Punjab, Andhra Pradesh, Maharashtra, and Tamil Nadu. The plant is a small bushy annual, 30-90 cm tall, with hairy trifoliate leaves, small pale yellow pea-like flowers, and small cylindrical pods (4-7 cm long) containing 4-10 seeds. The seeds are the part eaten — small (3-5 mm) oval beans with a black skin and a white interior (when split, they are sold as “urad dal dhuli” — the familiar cream-colored split lentil that is the foundation of south Indian cuisine). Black gram is exceptionally nutritious — rich in plant protein (about 24%), dietary fiber, complex carbohydrates, iron, potassium, magnesium, B vitamins (especially folate), and antioxidants. It is the foundation of south Indian cuisine — ground with rice into batter and fermented to make dosa, idli, vada, uttapam, and paniyaram. In north India, it is cooked whole (with skin) into the famous Punjabi dal makhani (the creamy black lentil curry simmered overnight with butter and cream), and split into the everyday urad dal tadka (yellow split lentils tempered with cumin, garlic, and chili). Black gram is also used in papadums (the crispy Indian lentil crackers), in sweets (urad dal laddoo), and as a flour (urad besan) for savory snacks. In Ayurvedic medicine, black gram is considered warming, grounding, and strength-giving — recommended for postpartum recovery, vata dosha, and as a general nutritive.
🧑🌾 Care requirements
Full sun
Regular; reduce before harvest
Moderate (50-70%)
20-35°C
Well-draining loam; pH 6.0-7.5
Inoculate with rhizobium; low-N, phosphorus/potassium
📋 Plant facts
- 🌍 Origin
- Indian subcontinent
- 📏 Max height
- 30-90 cm
- 📐 Spread
- 30-45 cm
- 🕰️ Bloom time
- Summer; small yellow pea-like flowers
- 🎨 Bloom color
- Pale yellow
- 🍃 Foliage color
- Trifoliate bright green leaves (hairy)
- ⏳ Lifespan
- Annual (1 season)
- 📈 Growth rate
- Fast — harvest in 70-90 days
- ☠️ Toxicity
- Non-toxic; safe for humans and pets
- 🌱 Propagation
- Seeds (direct sow)
🛡️ Health & Safety
Non-toxic; safe for humans and pets
Common issues
- Cercospora leaf spot, anthracnose, powdery mildew, yellow mosaic virus (transmitted by whiteflies), root rot, nematodes, aphids, whiteflies, thrips, jassids, pod borer, bruchid beetles (storage pest — destroys stored seeds)
💡 Care tips
- Direct sow seeds 2-3 cm deep, 10-15 cm apart, in rows 30-45 cm apart, after soil has warmed to 25°C. In India, sow with the monsoon (June-July for kharif crop) or in early spring (February-March for rabi/spring crop). Inoculate seeds with rhizobium bacteria before planting to boost nitrogen fixation. Plant in full sun in well-draining, moderately fertile loam enriched with compost. Black gram tolerates a wide pH range (6.0-7.5) but does NOT tolerate waterlogging (root rot). Water regularly during germination and flowering; reduce water as pods mature; stop watering when pods turn black and dry. Do not overwater — black gram is somewhat drought-tolerant and excessive moisture causes disease. Black gram is a low feeder (it fixes its own nitrogen) — apply phosphorus and potassium at planting; do NOT apply high nitrogen (reduces nodulation and yield). The plant grows rapidly — flowers 35-45 days after sowing, pods mature 60-80 days after sowing. Harvest when pods turn from green to black and dry (about 70-90 days after sowing) — pull entire plants and dry in the sun for 3-5 days, then thresh to release seeds. Store dried seeds in airtight containers — add dried neem leaves or a small amount of edible oil to prevent bruchid beetle infestation during storage. Save seeds from the best plants for next years planting — they remain viable for 1-2 years. Black gram is a great cover crop and green manure — it fixes 50-100 kg/ha of nitrogen and improves soil for the next crop. Rotate with cereals (rice, wheat, sorghum) to break pest cycles. Popular Indian cultivars include T-9, Pant U-30, Pant U-19, CO-5, LBG-20, and Vamban.
