How to Grow Yard Long Bean
Yard Long Bean
Vigna unguiculata subsp. sesquipedalis
vegetableYard long beans, also called asparagus beans, are a tropical legume producing slender pods that can reach 12-18 inches in length. With white seeds and a mild, slightly sweet flavor, they are a staple in Asian cuisine. These vigorous vining plants are heat-loving and more tolerant of hot, humid conditions than common snap beans.
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Example Yard Long Bean timeline · Pittsburgh, PA (Zone 6b)
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Plant Yard Long Bean
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 Yard Long Bean
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Yard Long Bean dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 9-11; can be grown as an annual summer crop in zones 5-8
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Seedling
7-14 daysCotyledons emerge and first true leaves appear. Plants are small and tender.
Keep soil consistently moist but not waterlogged. Provide protection from strong winds. Thin seedlings to proper spacing if direct seeded.
Vegetative Growth
3-4 weeksVigorous vine growth with compound leaves developing. Plants establish strong root systems and begin climbing.
Install sturdy support structure early (trellises, stakes, or poles). Keep consistently watered. Apply light fertilization every 3-4 weeks with balanced fertilizer.
Flowering
2-3 weeksPurple, pink, or white flowers appear in clusters along the vines. Flowers are small and self-pollinating.
Maintain consistent moisture and warmth. Continue fertilizing with slightly lower nitrogen to encourage pod set. Ensure good air circulation.
Pod Development
3-4 weeksLong, slender pods develop rapidly, reaching 12-18 inches in length. Pods are tender and light green when young.
Pick young, tender pods regularly (at 6-9 inches) to encourage continued production. Provide consistent water and nutrients during peak production.
Harvest
4-8 weeksPods are at peak quality when young and tender, before seeds bulge noticeably. Mature pods become tough and stringy.
Harvest every 2-3 days during peak season. Use sharp shears or scissors to avoid damaging vines. Continue picking to extend production season.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; use neem oil or insecticidal soap in severe cases. Increase humidity and air circulation.
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Spray with strong water stream; use neem oil or insecticidal soap. Encourage beneficial insects like ladybugs.
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Hand-pick insects and egg clusters. Use neem oil or organic insecticides if infestation is heavy.
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Improve air circulation. Spray with sulfur dust or baking soda solution. Avoid overhead watering.
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Use yellow sticky traps. Spray with neem oil or insecticidal soap. Remove heavily infested leaves.
Uses
Stir-fries and Asian dishes
CulinaryYard long beans are a staple in Asian cuisine, particularly Vietnamese, Chinese, and Thai cooking. Their mild, slightly sweet flavor and crisp texture make them ideal for stir-fries, curries, and steamed preparations. [source]
Fresh vegetables
CulinaryYoung, tender pods can be boiled, steamed, blanched, or served raw in salads. They provide a nutty flavor and are rich in vitamins A, C, and K. [source]
Nitrogen fixation and soil improvement
HouseholdAs a legume, yard long beans form nitrogen-fixing nodules on their roots, improving soil fertility. Growing them enriches the soil for subsequent crops. [source]
Pollinator support
WildlifeThe flowers attract bees and other pollinators, supporting biodiversity in the garden. [source]
Nutritional benefits
MedicinalRich in protein, fiber, and various minerals, yard long beans provide nutritional support and are used in traditional medicine for digestive health. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Begin harvesting when pods are 6-9 inches long, before seeds inside become prominently swollen. Use sharp shears to cut pods cleanly, avoiding vine damage. Harvest every 2-3 days during peak season to encourage continuous production. Young, tender pods are most tender and flavorful; mature pods become tough and stringy. Store in refrigerator for up to 5-7 days.
Fun Facts
- 🌱 Yard long beans get their name from their exceptional length, which can reach 18 inches or more, earning them the nickname 'snake beans' or 'asparagus beans' for their asparagus-like flavor profile.
- 🌱 Unlike common snap beans, yard long beans thrive in hot, humid tropical conditions and actually prefer higher temperatures, making them ideal for summer gardening in warm climates.
- 🌱 The white-seeded variety is particularly prized in Asian markets and is often more productive and heat-tolerant than colored-seed varieties, with some cultivars producing pods consistently until the first frost.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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