How to Grow Chinese Long Bean
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Chinese Long Bean
Vigna unguiculata subsp. sesquipedalis
vegetableChinese long beans, also called yard-long beans or asparagus beans, are vigorous climbing legumes that produce slender, elongated pods reaching 12-18 inches in length. Native to Southeast Asia, they thrive in warm climates and are prized for their tender texture and mild flavor. These heat-loving annuals are more tolerant of hot, humid conditions than snap beans.
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Example Chinese Long Bean timeline · Pittsburgh, PA (Zone 6b)
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Plant Chinese 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 Chinese Long Bean
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Chinese 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 summer annual in zones 5-8
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Get my Chinese Long Bean timeline →Growth Stages
Seedling
10-14 daysEmergence of cotyledons and first true leaves; small seedlings with delicate foliage
Protect from slugs and snails; ensure consistent moisture; maintain warm soil temperatures (70-80°F minimum)
Vegetative Growth
20-30 daysRapid vine elongation with compound leaves; plant develops climbing tendrils and bushy foliage
Install sturdy trellising or stakes early; apply balanced fertilizer; maintain consistent moisture; pinch tips if desired to encourage branching
Flowering
20-25 daysSmall purple, pink, or white flowers appear along the vines in clusters; flowers are delicate and ephemeral
Ensure adequate water and phosphorus for flower set; maintain warm temperatures; pollination is primarily by bees
Pod Development & Fruiting
15-20 daysLong, slender pods elongate rapidly, growing to 12-18 inches; pods remain tender and bright green
Harvest regularly to encourage continued production; maintain consistent watering; provide shade cloth in extreme heat (above 95°F) to prevent pod toughening
Harvest & Production
30-45 days (ongoing harvest)Mature tender pods ready for picking; continued flowering and pod development on vigorous vines
Pick pods every 2-3 days while young and tender (6-10 inches for best texture); avoid harvesting when plant is wet to prevent disease
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; use insecticidal soap; encourage beneficial insects like ladybugs
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Hand-pick beetles and eggs; use spinosad spray; apply neem oil; encourage native predators
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Spray with neem oil or insecticidal soap; maintain adequate humidity; remove affected foliage
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Increase humidity with regular misting; use miticide spray; encourage predatory mites
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Use yellow sticky traps; spray with insecticidal soap; apply neem oil weekly
Uses
Stir-fries & Asian cuisine
CulinaryChinese long beans are a staple in Southeast Asian cooking, particularly in stir-fries, curries, and dim sum dishes. Their tender texture and mild flavor make them ideal for quick cooking methods. [source]
Fresh vegetables & salads
CulinaryYoung, tender pods can be blanched and chilled for salads, or lightly steamed as a side dish. They pair well with garlic, ginger, and sesame oil. [source]
Nitrogen fixation & soil improvement
HouseholdAs a legume, Chinese long beans form nitrogen-fixing nodules on their roots, improving soil fertility naturally. Incorporating spent plants back into garden soil enriches it for future crops. [source]
Pollinator support
WildlifeThe delicate flowers attract bees, butterflies, and other beneficial pollinators, making this plant valuable for supporting local pollinator populations. [source]
Nutritional & traditional medicine
MedicinalChinese long beans are rich in vitamins A, C, and K, fiber, and plant-based protein. In traditional Asian medicine, they have been used to support digestion and overall 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
Harvest pods when young and tender, typically 6-10 inches long and before they become thick or tough (usually 7-10 days after flowering). Pick every 2-3 days to encourage continuous production; mature pods quickly become fibrous and less palatable. Pinch or cut pods with pruners to avoid damaging the vine. Harvest in the morning when pods are crisp. Continue harvesting until first frost.
Fun Facts
- 🌱 Chinese long beans can grow to 3 feet in length under ideal conditions, though they are typically harvested at 12-18 inches for optimal tenderness and flavor.
- 🌱 Unlike common snap beans, Chinese long beans actually perform better in heat and humidity, making them ideal for tropical and subtropical climates where regular bean varieties struggle.
- 🌱 The plant is sometimes called 'yard-long bean' because the pods were historically expected to reach one yard (36 inches) in length, though modern cultivars are bred for earlier, more tender harvest.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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