How to Grow Yard Long Bean, Purple Podded
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Yard Long Bean, Purple Podded
Vigna unguiculata subsp. sesquipedalis
vegetableYard long beans, also called asparagus beans, are vigorous climbing vines that produce exceptionally long, slender purple pods that can reach 12-18 inches in length. These tender legumes are popular in Asian cuisine and offer a delicate flavor similar to green beans with a slightly nutty taste. The purple varieties are prized for their striking color and excellent flavor when harvested young and tender.
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Example Yard Long Bean, Purple Podded timeline · Pittsburgh, PA (Zone 6b)
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Plant Yard Long Bean, Purple Podded
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, Purple Podded
Around Jun 6≈ 50 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Yard Long Bean, Purple Podded dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 6-10; can be grown in zones 5 and cooler as annuals after last frost
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Get my Yard Long Bean, Purple Podded timeline →Growth Stages
Germination & Seedling
2-3 weeksSeeds sprout within 7-14 days; seedlings develop first true leaves and begin climbing behavior
Soak seeds 2-4 hours before planting to speed germination. Provide sturdy support structure early. Keep soil consistently moist but not soggy.
Flowering
1-2 weeksSmall, delicate pink, white, or light purple flowers appear in clusters along the vine
Continue consistent watering and fertilizing. Avoid excess nitrogen, which promotes foliage over flowers. Pollination occurs naturally with bee activity.
Pod Development & Growth
2-3 weeksFlowers fade and long, slender purple pods rapidly elongate to 12-18 inches; pods may coil or twist
Increase watering during pod fill period. Apply potassium-rich fertilizer (0-10-10) weekly to support pod development. Monitor for pests and diseases.
Harvest Ready
4-8 weeks (extended if harvested regularly)Pods turn deep purple, become smooth and tender; flavor is mild and sweet when young
Begin harvesting when pods are 6-10 inches long for best tenderness and flavor. Frequent picking encourages continued flowering and production throughout season.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with strong water stream; use insecticidal soap or neem oil; encourage beneficial insects like ladybugs
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Hand-pick beetles and yellow egg clusters; use spinosad or neem oil; plant trap crops of nasturtium nearby
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Increase humidity; spray with water; use sulfur or neem oil in dry conditions
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Use yellow sticky traps; spray with neem oil or insecticidal soap; reflective mulch can deter
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Remove affected pods; use Bt (Bacillus thuringiensis); encourage parasitic wasps; weekly inspection
Uses
Stir-fries & Asian Cuisine
CulinaryYard long beans are a staple in Chinese, Thai, Vietnamese, and Filipino cooking. Their tender pods are ideal for quick stir-fries, curries, and steamed dishes where they retain a slight crunch and delicate flavor. [source]
Fresh and Cooked Vegetables
CulinaryThe purple pods can be blanched, sautéed, roasted, or boiled as a tender vegetable side dish. They can also be eaten raw when very young, similar to snap peas. [source]
Nitrogen Fixation & Soil Improvement
HouseholdLike other legumes, yard long beans fix atmospheric nitrogen through root nodules, enriching soil naturally and reducing the need for synthetic nitrogen fertilizers in subsequent crops. [source]
Pollinator & Beneficial Insect Support
WildlifeThe delicate flowers attract bees, butterflies, and other pollinators. The dense vine foliage provides shelter for beneficial insects that control garden pests. [source]
Dried & Stored Legume Protein
CulinaryMature, fully dried pods yield dried beans with approximately 25% protein content, providing a nutritious staple legume similar to other dried bean varieties. [source]
Harvest Tips
Begin harvesting when pods are 6-10 inches long (before they reach full 12-18 inch length) for maximum tenderness and sweetness. Pick every 2-3 days to encourage continued flowering and production. Pods become tougher and more fibrous when fully mature. Harvest in early morning when pods are crisp. The vines will produce for 4-8 weeks with regular harvesting. Avoid pulling vines; use pruning shears to cut pods cleanly.
Fun Facts
- 🌱 Yard long beans are called 'asparagus beans' in some regions due to their long, slender shape and delicate flavor profile that some compare to asparagus.
- 🌱 Purple-podded varieties contain higher levels of anthocyanins (purple pigments) than green varieties, offering additional antioxidant benefits that are lost when cooked, so lightly steaming preserves more color and nutrients.
- 🌱 A single healthy yard long bean plant can produce 50-100 pods over its growing season with proper care and frequent harvesting, making them highly productive and economical for home gardeners.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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