How to Grow Black Gram Plant U-31
Wikimedia Commons
Black Gram Plant U-31
Vigna mungo (L.) Hepper
vegetableBlack gram (urad) is a legume crop widely cultivated in South Asia, particularly India, for its nutrient-rich seeds used in traditional cuisines and as livestock feed. U-31 is a popular high-yielding variety known for improved disease resistance and consistent productivity. The plant produces small black seeds rich in protein, fiber, and essential micronutrients.
When should you plant Black Gram Plant U-31 in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Black Gram Plant U-31 timeline · Pittsburgh, PA (Zone 6b)
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Plant Black Gram Plant U-31
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Black Gram Plant U-31
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Black Gram Plant U-31 dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in warm tropical and subtropical zones 9-12; requires warm temperatures year-round
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Get my Black Gram Plant U-31 timeline →Growth Stages
Germination & Seedling
7-10 daysSeeds sprout within 5-7 days; seedlings emerge with cotyledons and develop first true leaves
Maintain soil moisture without waterlogging; ensure adequate sunlight; thin seedlings if densely sown
Vegetative Growth
30-40 daysPlant establishes root system and develops bushy foliage; height reaches 30-60 cm with multiple branches
Apply basal fertilizer; ensure consistent moisture; monitor for early pest infestations; mulch to retain soil moisture
Flowering
15-25 daysSmall white, pale yellow, or purple flowers appear in clusters at leaf axils; indicates transition to reproductive phase
Maintain optimal moisture during this critical stage; avoid nitrogen excess which promotes foliage over flowers; watch for pest and disease pressure
Pod Development & Filling
25-35 daysFlowers develop into small, slender pods containing 5-10 seeds; pods mature from green to black
Ensure consistent watering; apply potassium fertilizer to support pod fill; scout for pod borers and other pests
Maturity & Harvest
10-15 daysPods dry and turn completely black; seeds inside are hard and fully mature; plant desiccates
Reduce watering; monitor for optimal harvest timing when 80-90% pods are mature; prepare for mechanical or manual harvesting
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Use pheromone traps; apply neem oil spray; practice crop rotation; release natural parasitoids like Trichogramma
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Spray insecticidal soap; use reflective mulches; encourage natural predators; avoid excess nitrogen
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Use yellow sticky traps; apply neem oil; maintain adequate spacing for air circulation; remove infested plant parts
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Choose resistant varieties like U-31; practice crop rotation; control aphid vectors; remove infected plants promptly
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Improve drainage; avoid waterlogging; use Trichoderma-treated seeds; practice field sanitation
Uses
Traditional Legume Cuisine
CulinaryBlack gram is a staple in Indian, Sri Lankan, and Southeast Asian cuisines, used whole in curries or split (urad dal) in dals, dosas, and idlis. Rich in protein, it provides complete amino acids when combined with grains. [source]
Nutritional Supplement
CulinaryHigh in dietary fiber, iron, magnesium, and phosphorus; supports digestive health and bone density. Provides B vitamins and polyphenolic antioxidants. [source]
Ayurvedic & Traditional Medicine
MedicinalUsed in Ayurvedic medicine to balance Vata dosha; traditionally prepared as tonics and ground into healing pastes. Believed to support immune function and reduce inflammation. [source]
Livestock Feed & Soil Enrichment
HouseholdPlant residue (stover) used as nutritious fodder for cattle and other livestock. As a legume, it fixes atmospheric nitrogen, naturally enriching soil for subsequent crops. [source]
Cosmetic & Skincare Applications
CraftGround black gram seeds mixed with turmeric and milk create traditional beauty masks for skin brightening and exfoliation. Used in Ayurvedic beauty preparations. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest when 80-90% of pods have turned black and seeds rattle inside; typically 90-120 days after sowing. Cut plants at ground level or pull them manually; sun-dry for 7-10 days until seeds contain 10-12% moisture. Thresh by beating dried plants with sticks or using a mechanical thresher. Store seeds in dry, cool conditions in sealed containers.
Fun Facts
- 🌱 U-31 is an India Council of Agricultural Research (ICAR) released variety specifically bred for higher yields and disease resistance compared to older cultivars, making it a modern standard for commercial cultivation.
- 🌱 Black gram seeds can remain viable for 2-3 years in proper storage conditions, making them excellent for seed saving and ensuring food security in farming communities.
- 🌱 The plant simultaneously benefits soil fertility through nitrogen fixation while producing a protein-rich crop—a sustainable agricultural practice that reduces synthetic fertilizer dependence.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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