Ishikura is a traditional Japanese bunching onion that grows to an impressive two feet tall with tender, scallion-like stems reaching an inch across, yet never forms a bulb. This heirloom variety matures in just 40 to 50 days and thrives in both cool and warm seasons, making it remarkably adaptable for year-round harvesting. Its uniform flavor and size have made it a kitchen staple in Japanese cuisine for generations, and it grows with minimal fuss in full sun with proper spacing.
Full Sun
Moderate
3-10
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High
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Ishikura reaches extraordinary proportions, up to two feet tall and an inch in diameter, while staying tender and scallion-like throughout its growth. The real magic lies in its heat and cold tolerance; it handles both early spring and late summer planting without complaint, making it one of the most forgiving bunching onions for any climate. Mature in just 40 to 50 days, it's fast enough to grow multiple crops in a single season, and its uniform size makes it perfect for consistent harvests alongside other Asian greens.
This bunching onion shines in Japanese cooking, particularly in sukiyaki where its tender whites and delicate greens cook quickly alongside beef and vegetables. Use it fresh in salads, slice it into soups and broths, or grill the white bases for a mild, sweet onion flavor. The entire plant, from tender base to mild green tops, is edible and versatile in stir-fries, as a garnish, or simply as a fresh table condiment.
No timeline data available yet for this variety.
Sow seeds directly into garden soil in spring after the last frost, or in late summer for fall crops. Bunching onions can also be started indoors 4 to 6 weeks before your last spring frost if you prefer earlier harvests.
Begin harvesting Ishikura once plants reach 6 to 8 inches tall, typically 40 to 50 days from sowing. Harvest by cutting the outer leaves and stems at soil level, or pull entire plants if you prefer. The variety's uniform size makes it easy to spot when individual stems are ready; they'll be tender and mild-flavored at any stage, though they're particularly delicate when young. For continuous harvest, cut outer stems regularly and the plant will keep producing new growth.
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“Ishikura emerged as a traditional variety in Japan, where it became prized for both home gardeners and commercial growers who valued its reliability and uniform growth. The variety represents centuries of Japanese agricultural refinement, selected specifically for sukiyaki, soups, and fresh preparations where its tender texture and mild flavor shine. As a heirloom, it carries the accumulated knowledge of Japanese seed savers who preserved it precisely because it outperforms modern hybrids in flavor and adaptability.”