Vietnamese Black-Seeded Yard Long Bean Seeds – Đậu Đũa Hạt Đen

Vietnamese Black-Seeded Yard Long Bean Seeds

Grow a productive warm-season climbing vegetable with Mai’s Family Vietnamese Black-Seeded Yard Long Bean Seeds.

Also known as Đậu Đũa Hạt Đen, Yardlong Bean, Asparagus Bean, and Chinese Long Bean, this heat-loving annual produces vigorous climbing vines and long, tender green pods.

“Black-seeded” describes the dark seed coat of the fully mature seed. It does not mean that the young edible pods are black. For the best texture, harvest pods while they are young, smooth, slender, and before the seeds inside begin to enlarge.

Under suitable warm growing conditions, plants may begin producing harvestable pods in approximately 60–70 days. Actual timing may vary according to temperature, soil warmth, sunlight, moisture, daylength, and local growing conditions.

Product form: Seeds only. Live plants, fresh bean pods, trellises, soil, containers, fertilizer, and other growing supplies are not included.

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Important Variety Identity Note

“Vietnamese Black-Seeded Yard Long Bean” is used as a descriptive seed-lot name.

The exact combination of Vietnamese origin, yardlong bean type, and black mature seed has not been verified as an officially registered cultivar or germplasm selection.

This product is not advertised as Heirloom, Organic, Certified Organic, Untreated, Non-GMO, or Day-Neutral unless those characteristics are separately verified for the specific seed lot.

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Product Highlights

• Vietnamese Black-Seeded Yard Long Bean seeds
• Vietnamese name: Đậu Đũa Hạt Đen
• Also known as Yardlong Bean, Asparagus Bean, and Chinese Long Bean
• Botanical name: Vigna unguiculata subsp. sesquipedalis
• Warm-season climbing annual
• Produces long, tender green pods
• Dark or black mature seed coat
• Approximately 5–10 days to germination in warm soil
• Approximately 60–70 days to harvest under suitable conditions
• Direct sow after the final frost
• Full sun
• Requires a sturdy 6–8 foot trellis
• Suitable for hot, frost-free growing conditions
• Seeds only – not live plants

Product Details

Common Name	Vietnamese Black-Seeded Yard Long Bean
Vietnamese Name	Đậu Đũa Hạt Đen
Other Names	Yardlong Bean, Asparagus Bean, Chinese Long Bean
Botanical Name	Vigna unguiculata subsp. sesquipedalis
Genus	Vigna
Product Type	Vegetable Seeds
Identity Type	Descriptive Seed Lot
Plant Life Cycle	Warm-Season Annual
Growth Habit	Climbing Vine
Young Pod Color	Green
Mature Seed Color	Dark to Black Seed Coat
Germination Time	Approximately 5–10 Days in Warm Soil
Preferred Soil Temperature	Approximately 65–70°F or Warmer
Favorable Germination Temperature	Approximately 70–90°F
Seed Depth	Approximately 1 Inch
Plant Spacing	Approximately 6–12 Inches
Row Spacing	Approximately 3–4 Feet
Trellis Height	Approximately 6–8 Feet
Sunlight	Full Sun
Preferred Soil	Fertile, Loose, Well-Drained Soil
Preferred Soil pH	Approximately 6.0–6.8
Watering	Maintain Even Moisture Without Waterlogging
Approximate Harvest	Approximately 60–70 Days
Product Form	Seeds Only

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About Vietnamese Black-Seeded Yard Long Beans

Yardlong beans are heat-loving climbing plants grown for their long, slender pods. The vines require sturdy support and perform best during warm, frost-free weather.

The term “black-seeded” refers to the mature seed coat. Young edible pods are harvested while green and tender, before the seeds inside enlarge.

Because this is a descriptive seed lot, exact pod length, pod diameter, flowering time, mature seed color, tenderness, fiber, yield, and harvest timing may vary.

When to Plant

Direct sow after the final spring frost when the soil is warm, preferably approximately 65–70°F or higher.

Avoid sowing into cold, wet soil. Low temperatures and excessive moisture may result in slow or uneven emergence.

Starting indoors is usually unnecessary. In short-season areas, seeds may be started approximately 1–2 weeks early in biodegradable pots and transplanted carefully after nighttime temperatures remain warm.

How to Sow

1. Select a full-sun growing location.
2. Prepare fertile, loose, well-drained soil.
3. Install a strong trellis before or at planting time.
4. Sow seeds approximately 1 inch deep.
5. Space plants approximately 6–12 inches apart.
6. Allow approximately 3–4 feet between rows.
7. Water gently after sowing.
8. Keep the soil evenly moist without leaving it waterlogged.

Seeds may be planted slightly shallower in heavy soil and slightly deeper in light, sandy soil.

Germination

Seeds may germinate in approximately 5–10 days when planted in sufficiently warm soil.

Germination time may vary according to:

• Seed age and condition
• Soil temperature
• Moisture
• Planting depth
• Soil texture
• Weather
• Local growing conditions

Allow additional time when soil temperatures are cooler than the preferred range.

Trellising

Install a sturdy trellis approximately 6–8 feet tall at planting time.

Guide young vines toward the support as they begin climbing.

A sturdy trellis helps:

• Support vigorous vine growth
• Keep vines and pods off the ground
• Make long pods easier to locate
• Provide easier access during harvest
• Reduce tangling along the soil surface

Sunlight

Grow in full sun, preferably with six or more hours of direct sunlight daily.

Soil

Use fertile, loose, well-drained soil with a preferred pH of approximately 6.0–6.8.

Avoid excessive nitrogen feeding. Too much nitrogen may encourage heavy vine growth with fewer pods.

Watering

Keep the soil evenly moist, especially during flowering and pod development.

Water near soil level whenever practical and avoid keeping the soil continuously saturated.

Mulch may be applied after the soil has warmed to help maintain more consistent moisture.

Flowering and Daylength Note

Yardlong bean flowers are generally self-pollinating. However, flowering time may vary according to genetics, temperature, and daylength.

This descriptive seed lot should be evaluated locally to confirm how promptly flowering begins during long summer days, especially in northern growing regions.

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Harvesting

Plants may begin producing harvestable pods in approximately 60–70 days under suitable growing conditions.

Harvest pods while they are:

• Young
• Green
• Smooth
• Slender
• Approximately pencil-thick
• Tender
• Picked before the seeds inside enlarge

Frequent harvesting helps keep the vines productive.

Tender pods may be harvested at approximately 10–12 inches long, although yardlong bean pods can grow considerably longer.

Do not judge harvest readiness by length alone. Pod diameter, tenderness, fiber development, and enlargement of the seeds should also be considered.

Culinary Uses

Young green pods may be prepared in:

• Vietnamese dishes
• Stir-fries
• Soups
• Curries
• Steamed vegetable dishes
• Sautéed dishes
• Braised recipes
• Mixed vegetable dishes
• Other cooked preparations

Harvest pods while young for the best texture.

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Quick Growing Guide

Product Name	Vietnamese Black-Seeded Yard Long Bean
Vietnamese Name	Đậu Đũa Hạt Đen
Botanical Name	Vigna unguiculata subsp. sesquipedalis
Identity	Descriptive Seed Lot
Life Cycle	Warm-Season Annual
Growth Habit	Climbing Vine
Planting Time	After Final Frost When Soil Is Warm
Germination	Approximately 5–10 Days
Seed Depth	Approximately 1 Inch
Plant Spacing	Approximately 6–12 Inches
Row Spacing	Approximately 3–4 Feet
Trellis	Approximately 6–8 Feet Tall
Sunlight	Full Sun
Soil	Fertile and Well-Drained
Soil pH	Approximately 6.0–6.8
Watering	Maintain Even Moisture Without Waterlogging
Approximate Harvest	Approximately 60–70 Days
Product Form	Seeds Only

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Package Information

Package quantity is shown in the selected product option and on the product label.

This listing contains one packet of Vietnamese Black-Seeded Yard Long Bean seeds unless otherwise stated.

Important Product Notice

This listing contains seeds only.

The package does not include:

• Live plants
• Fresh bean pods
• Trellis or supports
• Soil or growing medium
• Containers
• Fertilizer
• Gardening tools
• Other growing supplies

Germination and field performance depend on seed age, soil warmth, moisture, planting depth, daylength, sunlight, weather, and local growing conditions.

Exact pod length, pod diameter, tenderness, fiber development, mature seed color, flowering time, maturity, and yield may vary.

This product is sold under the descriptive lot name “Vietnamese Black-Seeded Yard Long Bean.” It is not represented as a registered cultivar, Heirloom, Organic, Certified Organic, Untreated, Non-GMO, or Day-Neutral unless separately verified.

Mai’s Family LLC
Love Plants, Love Earth.