A close-up view of a cluster of Tankuro Soybeans with fresh beans and pods on a white background.
A close-up view of steamed Tankuro Soybeans.
A black rectangular plate of steamed Tankuro Soybeans on a light blue background.
Cooked Tankuro Soybeans in a couple small dishes surrounded by more soybeans on a white background.
A blue bowl full of dried Tankuro Soybeans with dried pods and beans on a vintage Japanese book.
A close-up view of a cluster of Tankuro Soybeans with fresh beans and pods on a white background.
A close-up view of steamed Tankuro Soybeans.
A black rectangular plate of steamed Tankuro Soybeans on a light blue background.
Cooked Tankuro Soybeans in a couple small dishes surrounded by more soybeans on a white background.
A blue bowl full of dried Tankuro Soybeans with dried pods and beans on a vintage Japanese book.

Soybean Seeds,
Tankuro

4.914 ReviewsSKU: #SY103Min. seed count: 30
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Regular price $4.00
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Description

(Glycine max) We are excited to offer this premium soybean from Japan. After years of trialling and tasting, we finally found our favorite edamame variety. It has superior flavor and vigorous growth habit. This variety is highly regarded in Japan for its sweet flavor. It is perfect for edamame, or allow the beans to mature to a deep black and make into soy milk, tofu, and so much more. A perfect homesteader’s or home gardener’s beginner soybean with amazing flavor to boot.

Growing Tips: Tankuro soybeans are best grown in warm conditions with full sunlight, requiring at least eight hours of sunlight daily. They need well-drained, loamy soil with a pH of 6 to 6.8. Regular watering is essential, especially during germination and flowering stages. Mulching helps retain soil moisture and control weeds. Tankuro soybeans also benefit from crop rotation to avoid pest and disease buildup​​.

Plant Details

Botanical Name
Glycine max
Life Cycle
Annual
Growth Habit
Bush
Sun Requirement
Full sun
Days to Germinate
5–18
Days to Maturity
80
Planting Depth
1 in.
Plant Spacing
6 in.
Ideal Temperature
65–90°F
Frost Hardy
No

When to Grow

Plant Tankuro soybeans in late spring after the last frost when soil temperatures reach at least 60 F. The ideal temperature for growing is 65-90 F. In regions with shorter growing seasons, start seeds indoors no more than 2-3 weeks before the last frost in deep cells or soil blocks to limit root disturbance, and transplant once the soil is at least 60 F. Avoid planting too late in the season to ensure proper growth and yield. If you're not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

How to Sow and Plant

Directly sow Tankuro soybean seeds 1 inch deep and 4-6 inches apart in rows 2 feet apart. Ensure the soil is moist but not waterlogged to prevent seed rot. Thin the seedlings to about 6 inches apart once they are 4 inches tall to promote healthy growth. Sprouts form in 5-18 days.

How to Grow

Tankuro soybeans grow between 1 to 3 feet tall and do not require staking. They should be watered regularly, providing about 1 inch of water per week, increasing to 1.5 inches during flowering and 1.75 inches as pods form. These soybeans are nitrogen-fixers, so additional nitrogen fertilization is not necessary. Apply compost mid-summer to supply additional nutrients​.

How to Save Seeds

  • This annual self-pollinating crop will not readily cross with other soybean varieties. However, a distance of 10-20 feet between different soybean varieties will really ensure purity.
  • Allow pods to brown and dry on the plant.
  • If frost or wet weather is expected, pull plants and hang indoors in a warm, dry location until seeds are fully dry.
  • Test with your fingernail; seeds that can't be dented are mature enough to store.
  • Store in a cool, dark, dry location.

FAQ

What is the best time to harvest Tankuro soybeans?

Harvest Tankuro soybeans when the pods are bright green, plump, and 2-3 inches long for edamame. For dried beans, wait until the pods turn brown and the leaves yellow, then pull up the entire plant to dry.

Can I grow Tankuro soybeans in containers?

Yes, Tankuro soybeans can be grown in containers at least 12 inches deep, which provides adequate space for root development. Ensure consistent moisture and sunlight for optimal growth.

Are Tankuro soybeans frost-hardy?

No, Tankuro soybeans are not frost-hardy. Plant them well after the last frost and avoid exposing them to temperatures below freezing.

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