Old Tokyo Komatsuna is a traditional Japanese leafy green that blurs the line between spinach and mustard so cleverly that many gardeners are surprised to learn it's actually a brassica. With mild, sweet leaves that taste more like spinach than the peppery bite you'd expect from a mustard, this heirloom variety delivers the tender texture and flavor you crave alongside the serious nutritional punch of its mustard family heritage. Ready to harvest in just 45 to 50 days, it grows vigorously in cool to moderate temperatures and tolerates frost, making it a reliable crop for spring and fall gardens. Space plants 6 inches apart in full sun with moderate water and slightly neutral soil, and you'll have armfuls of glossy, mouth-watering leaves.
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This old Tokyo strain represents one of the most underrated leafy greens in the vegetable garden, combining the best qualities of two entirely different plant families into a single, elegant leaf. The flavor is its superpower: mild and sweet like spinach, yet nutritionally dense like mustard greens, creating a mild green that works in salads, stir-fries, and cooked preparations without overpowering more delicate dishes. Its frost tolerance and rapid 45 to 50-day harvest window mean you can fit multiple successions into a single season, from early spring through late fall.
Old Tokyo Komatsuna shines as a fresh, mild leafy green in salads where its tender texture and sweet flavor won't overwhelm other ingredients. It excels in stir-fries and quick sautés, wilting gracefully without the bitterness of stronger greens. The leaves work beautifully in soups, steamed as a side dish, or layered into grain bowls. Its mild, spinach-like character makes it approachable for cooks who find other mustard greens too peppery, yet it delivers the nutritional density those greens are famous for.
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Start seeds indoors 4 to 6 weeks before your intended transplant date, sowing them in a soil temperature of 55 to 70 degrees Fahrenheit. Keep the soil consistently moist and provide bright light to prevent leggy seedlings. Harden off seedlings by gradually exposing them to outdoor conditions over 7 to 10 days before moving them to the garden.
Transplant seedlings outdoors when they have developed their first true leaves and after hardening off is complete. Space plants 6 inches apart in garden beds prepared with compost or aged manure. Transplant in spring as soon as soil is workable, or in mid-to-late summer for a fall crop.
Direct sow seeds outdoors in spring as soon as soil is workable, or in summer 8 to 10 weeks before your first fall frost. Sow seeds and thin seedlings to 6 inches apart once they develop their first true leaves.
Begin harvesting outer leaves once the plant reaches a usable size, typically 30 to 35 days after planting, or wait for the entire plant to mature at 45 to 50 days for a full harvest. Outer leaves can be picked continuously throughout the season, encouraging the plant to produce more foliage from the center. For a complete harvest, cut the entire plant at soil level. Harvest in the morning when leaves are crisp and full of moisture. This variety's cold tolerance means you can continue harvesting well into fall and even after light frosts, when the flavor often becomes sweeter.
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“This komatsuna strain carries a lineage rooted in Tokyo, Japan, where it evolved as a traditional leafy vegetable within Japanese cuisine and gardening culture. Komatsuna itself represents a remarkable moment in vegetable breeding history, a brassica that was developed and refined over centuries in Japan to deliver spinach-like tenderness and flavor while maintaining the nutritional superiority of its mustard family relatives. Old Tokyo represents a preserved version of this heritage, maintained and passed down through generations of seed savers who recognized its value as a home garden staple, and now offered by heirloom seed companies to gardeners seeking authentic, time-tested varieties.”