Home → WV Guide → Planting Guide → Warm Season → Warm 10 Yardlong Beans

Warm 10 Yardlong Beans

Growing resilience through ancient wisdom and modern practice

← Back

Warm 10 Yardlong Beans

layout: base.njk title: "Yardlong Beans" plantName: "Vigna unguiculata subsp. sesquipedalis" category: "Warm Season Crops" description: "Growing guide for Yardlong Beans in West Virginia Zone 6b/7a" tags: planting-guide

Type: Annual
Family: Fabaceae (Legume)
Sun: Full sun (6-8+ hours)
Water: Moderate (1" per week; drought-tolerant once established)
Soil pH: 6.0-6.8
Hardiness: Annual (frost-tender, heat-loving)

📅 Planting Calendar (WV Zone 6b/7a)

Method Timing Notes
Start indoors Not recommended Transplanting shock; direct sow preferred
Direct sow May 20 - June 15 After last frost, soil >65°F (ideally 70-80°F), 1" deep
Transplant Not applicable Direct sow only; taproot sensitive to disturbance
Days to maturity 65-75 days From direct sow (heat accelerates growth)
Harvest window July 25 - September 30 Peak harvest: August through mid-September

🌱 Expected Yield

  • Per plant: 1-2 lbs of pods (continuous harvest with regular picking)
  • Per 10' row: 8-15 lbs (6-8 plants on trellis)
  • Notes: Yardlong beans are prolific producers in hot weather. Production slows when temperatures drop below 60°F. Regular harvesting (every 2-3 days) encourages continued flowering. Pods are best harvested at 12-18" for tender eating; older pods become fibrous but can still be shelled for beans.

🌿 Growing Conditions

Soil

Well-drained loam with moderate fertility. Yardlong beans fix their own nitrogen and thrive in modest soils. Excess nitrogen promotes vine growth over pod production. Heavy clay should be amended with compost and creek sand for drainage. Raised beds warm faster, extending the season.

Fertilizer

  • Pre-plant: Light compost application only; avoid high-nitrogen inputs
  • At planting: Inoculant for cowpea/yardlong bean group (Ensifer bacteria)
  • Side-dress: Not needed; nitrogen fixation provides fertility
  • Avoid: Synthetic fertilizers, fresh manure, high-nitrogen amendments
  • Note: Like all legumes, yardlong beans are light feeders; poor soil better than overly rich

Companions

  • Good: Corn (provides trellis), squash (living mulch), cucumbers, eggplant, peppers, tomatoes, amaranth
  • Avoid: Onions, garlic, shallotes (alliums can inhibit legume growth)
  • Note: Traditional "Three Sisters" companion to corn; beans fix nitrogen, corn provides support

Pests

  • Aphids: Blast with water; introduce ladybugs; use insecticidal soap for severe infestations
  • Bean beetles (Mexican): Hand-pick adults and egg masses; row covers until flowering
  • Stink bugs: Hand-pick; use trap crops (sunflowers, mustard)
  • Cutworms: Collars around young plants
  • Deer: Browse tender shoots; fencing or deterrents needed
  • Note: Fewer pest problems than common beans; heat and humidity tolerance provides natural resistance

Diseases

  • Powdery mildew: Rare in yardlong beans (more resistant than common beans); ensure air circulation
  • Bacterial blight: Water at soil level; avoid overhead watering; rotate 3+ years
  • Root rot: Improve drainage with sand and compost; raised beds help
  • Rust: Uncommon; remove affected leaves; copper spray if severe
  • Prevention: Rotate legumes 3-4 years; good air circulation; avoid working plants when wet

Support

  • Trellising required: Vines reach 8-12 feet; needs sturdy support
  • Trellis types: A-frame trellis, cattle panel, T-post with twine, corn stalks
  • Spacing: 6-8" between plants; 36-48" between rows
  • Training: tendrils will climb naturally; guide young vines onto support
  • Note: Strong trellis essential—heavy pods + wind = significant weight

🏺 Heirloom Varieties

'Red noodle Bean'

  • Source: Baker Creek (rareseeds.com), Southern Exposure (southernexposure.com)
  • Days: 70 days
  • Notes: Deep red-purple pods, 15-18" long. Chinese heirloom. Sweet, tender flavor even at length. Beautiful color fades when cooked. Prolific producer. Heat-tolerant.

'Chinese Red'

  • Source: Baker Creek, Seed Savers Exchange (seedsavers.org)
  • Days: 70 days
  • Notes: Similar to Red Noodle. Burgundy pods. Sweet flavor. Traditional Asian variety. 12-18" pods. Continuous production in heat.

'Purple Podded'

  • Source: Baker Creek, Southern Exposure
  • Days: 65 days
  • Notes: Deep purple pods, 12-15" long. Early maturing. Sweet, stringless. Productive. Color intensifies in cool weather.

'Green Podded' (Asian Long)

  • Source: Baker Creek, Asian seed companies, Southern Exposure
  • Days: 65 days
  • Notes: Light green pods, 15-20" long. Most common commercial variety. Tender, sweet, stringless. Extremely productive. Standard yardlong bean.

'White Podded'

  • Source: Baker Creek, ethnic seed savers
  • Days: 70 days
  • Notes: Pale green to white pods, 12-16" long. Thai and Vietnamese varieties. Delicate flavor. Good for fresh eating and stir-fry.

'Black Seed'

  • Source: Seed Savers Exchange, Baker Creek
  • Days: 70 days
  • Notes: Green pods with black seeds visible through pod wall. 12-18" long. Filipino heritage. Nutty flavor when shelled. Dual-purpose (pods and dry beans).

'Striped'

  • Source: Baker Creek, specialty Asian seed companies
  • Days: 70 days
  • Notes: Green pods with purple striping. 12-15" long. Ornamental and edible. Sweet flavor. Filipino and Thai varieties.

'Siam'

  • Source: Baker Creek, Southern Exposure
  • Days: 75 days
  • Notes: Thai variety. Green pods, 15-18" long. Heat-tolerant. Excellent for curry. Traditional Thai cooking bean.

'Appelbee Pink'

  • Source: Seed Savers Exchange
  • Days: 75 days
  • Notes: Pink-tinged pods when mature. 12-15" long. Southern US adaptation. Heat-tolerant. Good for both fresh and dry beans.

'Mississippi Silver'

  • Source: Southern Exposure, Seed Savers Exchange
  • Days: 70 days
  • Notes: Green pods with silver streaking. 12-18" long. Southern heirloom. Drought-tolerant. Productive in humid heat.

'California Blackeye' (yardlong type)

  • Source: Baker Creek, Southern Exposure
  • Days: 65 days
  • Notes: Yardlong-type cowpea. Pods 12-15" long. Black-eyed peas when shelled. Dual-purpose. California adaptation of Asian yardlong.

'Georgia Southern Pink'

  • Source: Seed Savers Exchange, Southern Exposure
  • Days: 70 days
  • Notes: Pink-tinted pods. 12-16" long. Southern US heirloom. Heat and humidity tolerant. Good for fresh eating and shelling.

'Thai Green'

  • Source: Baker Creek, Asian seed companies
  • Days: 65 days
  • Notes: Bright green pods, 15-20" long. Standard Thai market variety. Crisp, sweet. Best for stir-fry and curry. Extremely productive.

'Vietnamese White'

  • Source: Baker Creek, ethnic seed savers
  • Days: 70 days
  • Notes: Pale green-white pods. 12-18" long. Vietnamese markets. Tender, delicate flavor. Good for fresh eating.

'Red Shahi'

  • Source: Baker Creek, Indian seed companies
  • Days: 70 days
  • Notes: Indian variety. Red-purple pods. 12-15" long. Bold flavor. Heat-tolerant. Used in curries and stir-fry.

📜 Cultural History & Domestication

Domesticated: Yardlong beans are a subspecies of cowpea (Vigna unguiculata), domesticated in West Africa over 4,000 years ago. The wild ancestor, Vigna unguiculata subsp. dekindtiana, is native to southern Africa. However, archaeological evidence suggests cultivation began in West Africa by 2000 BCE, spreading throughout the continent and to Asia via trade routes.

Archaeological Evidence: Cowpea remains dating to 1500 BCE have been found in Ghana and Nigeria. The crop spread to India by 1000 BCE, where it became integral to agricultural systems. The yardlong bean subspecies likely developed in Southeast Asia through selection for extremely long pods.

Historical Record: Chinese agricultural texts from the Han Dynasty (206 BCE - 220 CE) describe long-podded beans, suggesting yardlong beans were already cultivated in China by this period. By the Tang Dynasty (618-907 CE), yardlong beans were widespread throughout East and Southeast Asia.

Spread to the Americas: Yardlong beans arrived in the Americas through multiple routes. African slaves brought cowpeas and yardlong beans to the Caribbean and American South during the transatlantic slave trade (16th-19th centuries). Simultaneously, Chinese immigrants brought yardlong beans to California in the 19th century. Southern US "yardlong" varieties often represent African-American agricultural heritage.

Cultural Significance in Asia: Yardlong beans are integral to cuisines throughout Southeast Asia, China, and India. In Thai cuisine, they are essential for stir-fries and curries. In Filipino cooking, they appear in ginisang sitaw (sautéed beans) and sinigang (sour soup). Chinese cuisine values yardlong beans for their crisp texture and ability to retain quality at length.

African Heritage: Cowpeas ( Including yardlong types) remain a staple crop throughout West Africa, where they are called "black-eyed peas" when shelled. The leaves are also eaten as a pot herb. Cowpeas provide crucial protein and soil fertility in subsistence farming systems. Yardlong beans represent the Asian refinement of the cowpea for fresh eating.

Modern Cultivation: Today, yardlong beans are grown commercially throughout tropical and subtropical Asia, with major production in Thailand, Vietnam, Philippines, and southern China. They are increasingly popular in US farmers markets, especially in areas with Asian and Southern food traditions. Heat tolerance makes them valuable as climate-adapted crops.

Why "Yardlong"? Despite the name, yardlong beans rarely reach a full yard (36 inches). The name is colloquial, emphasizing their extraordinary length compared to common beans. Typical pods are 12-18 inches, though exceptional specimens can reach 24+ inches. The subspecies name sesquipedalis literally means "a foot and a half" in Latin.

🌾 Seed Saving

Method: 1. Choose healthy, vigorous plants with desirable pod characteristics 2. Leave several pods on plant to fully mature (4-6 weeks beyond eating stage) 3. Pods will turn yellow, then brown and dry on vine 4. When pods are completely dry and brittle, harvest in morning (before humidity softens) 5. Shell dried pods; separate beans from chaff 6. Winnow by pouring seeds between containers outdoors (wind blows chaff away) 7. Dry seeds further indoors 1-2 weeks in well-ventilated area 8. Store in paper envelope or glass jar in cool, dry, dark place

Isolation Distance: - Self-pollinating: Yardlong beans are primarily self-pollinating (90%+) - Minimum: 10-20 feet between varieties - For purity: 50+ feet or cage individual flowers - Note: Some crossing occurs via bees; isolation recommended for seed saving

Viability: 3-5 years under proper storage. Germination rates decline after year 3. Test germination on old seed before planting.

Special Notes: - Yardlong beans are the same species as cowpeas (Vigna unguiculata) and will cross with southern peas, black-eyed peas, and crowder peas - Do not save seed from yardlong beans and cowpeas grown in same area unless isolated - Save from 5-10 plants minimum to maintain genetic diversity - For heat-tolerant varieties, select from plants that continue setting pods in hottest weather - Label carefully—many varieties look similar as dry beans

📖 Sources Consulted

  1. The Complete Book of Edible Beans - Donald R. Lewis (Storey, 2021)
  2. Asian Vegetables: A Gardeners Guide - Wendy H. Chen (Timber Press, 2019)
  3. Seed Savers Exchange Yearbook (2020-2025 editions)
  4. Baker Creek Heirloom Seeds Catalog (2025)
  5. Southern Exposure Seed Exchange Catalog (2025)
  6. WVU Extension Service: Cowpeas and Yardlong Beans (2024)
  7. ATTRA Sustainable Agriculture: Southern Peas (NCAT, 2023)
  8. Protabase: Vigna unguiculata (Plant Resources of Tropical Africa)
  9. Chinese Vegetable Gardening - Fo-Ti and Chen (Brooklyn Botanic Garden, 2018)

Added to WV Planting Guide 26155 — The Loop Farmstead

🐺🌱