How to Grow Yardlong Bean (White Seeded)
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Yardlong Bean (White Seeded)
Vigna unguiculata subsp. sesquipedalis
vegetableYardlong beans, also called asparagus beans, are a tropical legume producing long, slender pods that can reach 12-36 inches in length. The white-seeded variety produces cream or white seeds and is prized for its tender, flavorful pods with a texture between green beans and asparagus. These heat-loving vining plants are staple crops in Southeast Asian and African cuisines.
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Example Yardlong Bean (White Seeded) timeline · Pittsburgh, PA (Zone 6b)
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Plant Yardlong Bean (White Seeded)
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 Yardlong Bean (White Seeded)
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Yardlong Bean (White Seeded) dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in warm zones 9b-11; can be grown in zone 8-9a with protection and extended season techniques
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Get my Yardlong Bean (White Seeded) timeline →Growth Stages
Seedling
2-3 weeksYoung plants emerge with cotyledons and develop first true leaves; vines are still compact and tender.
Protect from direct strong wind. Keep soil evenly moist. Provide light shade in extremely hot climates during this stage. Thin to proper spacing once 2-3 true leaves appear.
Vegetative/Vine Growth
3-4 weeksRapid vine elongation with multiple stems and leaflets developing. Vines begin climbing and need support structure.
Install trellis, stakes, or string support early before plants become tangled. Feed lightly with balanced fertilizer every 3-4 weeks. Pinch back growing tips if vines become too dense to encourage branching.
Flowering
2-3 weeks, overlaps with early pod developmentSmall white, pink, or purple flowers appear in clusters along the vines. Flowers are short-lived but abundant.
Reduce nitrogen to encourage pod set rather than excess foliage. Ensure consistent watering during this critical stage. Do not overwater as it can cause flower drop.
Pod Development and Fruiting
4-6 weeks for main harvest periodPods rapidly elongate to 12-36 inches depending on variety and conditions. Pods transition from tender green to mature, seeds developing inside.
Begin harvesting when pods reach desired length (typically 8-15 inches for tender eating). Regular harvesting encourages continued production. Provide consistent water and light feeding with diluted liquid fertilizer.
Mature/Seed Stage
2-3 weeksPods fully mature with visible seed bulges inside (especially the white seeds in this variety). Pods may dry on vine if left unharvested.
Leave select pods on vine to mature fully if saving seeds. Allow pods to dry completely before harvesting seeds. For culinary use, harvest before reaching this stage for tender texture.
Common Pests
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Spray with water to dislodge; use neem oil or sulfur dust in severe cases; ensure adequate humidity
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Use insecticidal soap, neem oil, or introduce beneficial insects like ladybugs; spray early morning or evening
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Hand-pick beetles and eggs daily; use neem oil; row covers during early season; plant trap crops
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Yellow sticky traps; spray undersides of leaves with insecticidal soap; ensure good air circulation
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Row covers during early growth; hand-pick; neem oil spray; encourage natural predators
Uses
Stir-fries and Asian Cuisine
CulinaryYardlong beans are a staple in Southeast Asian cooking, prized for their tender texture and subtle flavor. Cut into 2-3 inch lengths and quickly stir-fried with garlic, ginger, and sauce. [source]
Fresh and Cooked Preparations
CulinaryCan be steamed, boiled, roasted, or eaten raw in salads when young and tender. White-seeded varieties are particularly valued for their clean flavor and fine texture. [source]
Seed Harvest
CulinaryMature white seeds can be dried and used like other dried beans in soups and stews, providing protein and nutritional value. [source]
Nitrogen Fixation and Soil Amendment
HouseholdAs a legume, yardlong beans fix atmospheric nitrogen into the soil through symbiotic relationships with Rhizobium bacteria, enriching soil for subsequent crops and reducing fertilizer needs. [source]
Pollinator Attraction
WildlifeFlowers attract bees, butterflies, and other beneficial insects, supporting pollinator populations and nearby crops. [source]
Harvest Tips
Harvest pods when 8-15 inches long for optimal tenderness and flavor; pods become tough and stringy if left too long. Pick every 2-3 days to encourage continued flowering and pod production. Use sharp scissors or knife to avoid damaging vines. Harvest in early morning when pods are crisp. For seed saving, allow select pods to fully mature on vine until completely dry and brittle, then shell and store seeds in cool, dry conditions.
Fun Facts
- 🌱 Despite their name, yardlong beans typically grow to only 12-24 inches, rarely reaching a full yard (36 inches), though some exceptional cultivars can achieve this length.
- 🌱 The white-seeded varieties are less commonly grown than black-eyed and brown-seeded types but are prized in African cuisines and are gaining popularity in Western gardens for their milder flavor.
- 🌱 Yardlong beans are also called asparagus beans because their texture and flavor more closely resemble asparagus than traditional snap beans, making them a sophisticated vegetable choice.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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