Tankuro edamame soybean is a dual-purpose Japanese cultivar that delivers both fresh pods and dry beans from a single, compact plant. These distinctive black soybeans mature in 80-89 days and grow 24-36 inches tall, thriving in zones 3-9 with moderate water and full sun. Open-pollinated and high-yielding, Tankuro represents a culturally significant strain that gardeners can save seeds from year to year, making it both a practical harvest and a link to Asian agricultural heritage.
Full Sun
Moderate
3-9
36in H x ?in W
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Low
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Black soybeans with genuine versatility set Tankuro apart. Gardeners can harvest tender green pods for edamame in early summer or let plants mature fully for dried beans suitable for traditional cooking. The upright, bushy growth habit fits neatly into garden plots, containers, and raised beds, while consistent yields across diverse climates reward both beginners and experienced growers.
Tankuro excels in two distinct harvest windows. In early summer, gardeners pick plump green pods and boil them simply with salt for fresh edamame, a protein-rich snack. For those with patience, allowing plants to mature fully yields dried black beans ideal for simmering into soups, stir-fries, fermented pastes, and traditional Asian grain bowls. The versatility means a single planting serves multiple culinary purposes.
No timeline data available yet for this variety.
Direct sow seeds into warm soil once temperatures reach 60-75°F and frost danger has passed. Sow seeds 1 inch deep, spacing them 8 inches apart in rows 24 inches apart. Seeds typically germinate within 7-10 days in consistently warm, moist soil.
For edamame, harvest green pods when they feel plump and tender, typically 3-4 weeks before full maturity. Gently snap or cut pods from the stem, then boil immediately or freeze. For dried beans, allow plants to mature fully; leaves will yellow and drop, and pods will brown and feel papery to the touch. Pull entire plants and hang upside down in a warm, dry location for 2-3 weeks until pods dry completely, then shell out the black beans and store in a cool, dry place.
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“Tankuro soybeans carry deep roots in Asian agriculture, particularly Japanese soybean cultivation. As an open-pollinated, heirloom variety, this strain has been preserved and passed through generations of gardeners who valued its dual-purpose capability and reliability. The fact that it remains non-GMO and open-pollinated reflects a deliberate choice to maintain genetic diversity and seed-saving autonomy, ensuring home gardeners can grow, harvest, and replant year after year without purchasing new seed.”