Mizuna

Direct sow mizuna seeds 1/4 inch deep as soon as soil can be worked in spring, or start indoors 3-4 weeks before last frost. Seeds germinate rapidly in 4-7 days at 40-75°F. Thin to 6 inches apart for full-sized plants or broadcast thickly for baby greens. Rows should be 8-12 inches apart.

Mizuna is one of the most forgiving and productive greens in the garden. It tolerates cold down to 10°F with protection and handles heat better than most Asian greens. Provide consistent moisture and partial shade in warm weather to maintain mild flavor. Feed lightly with balanced fertilizer every 3-4 weeks. Plants form attractive mounds of feathery, deeply serrated leaves.

Succession sow every 2-3 weeks for continuous harvest. Mizuna excels as a cut-and-come-again crop, regrowing vigorously after harvest for 3-4 cuttings. In fall, extend the season with row covers or cold frames; mizuna continues producing long after other greens have succumbed to frost. Self-sows readily if allowed to flower, providing volunteer plants in subsequent seasons.

Mizuna (Brassica rapa var. nipposinica) originated in Japan, where it has been cultivated for centuries as a traditional leafy vegetable. Its exact wild ancestor is uncertain, but it derives from the same Brassica rapa species complex that gave rise to turnips in Europe and bok choy in China — a testament to the remarkable plasticity of this single species under human selection. The earliest written references to mizuna appear in Japanese agricultural texts from the Edo period (1603-1868), though the crop is almost certainly older, cultivated long before formal documentation.

Mizuna is most closely associated with Kyoto, where it is classified as one of the prized 'kyo-yasai' (Kyoto vegetables) — traditional heirloom varieties that have been maintained and celebrated in the region's cuisine for generations. In Kyoto's markets, mizuna remains a winter staple, used in hot pots, soups, pickles, and lightly dressed salads. The plant was traditionally grown in the rich alluvial soils along rivers and irrigation channels surrounding the city, and its name ('water greens') likely reflects this association with wet, fertile growing sites.

Mizuna was largely unknown outside Japan until the late 20th century, when the global interest in Asian cuisines and baby salad mixes brought it to Western markets in the 1990s. It quickly became a favourite of market gardeners and mesclun growers in Europe and North America due to its extraordinary speed of growth, cold hardiness, mild flavour accessible to Western palates, and the visual appeal of its finely serrated, feathery leaves. Today, mizuna is grown commercially on every continent and is widely available in supermarkets as a component of pre-washed salad blends. Despite its global spread, it remains most deeply embedded in the food culture of the Kansai region of Japan, where it is eaten in volumes far exceeding those of any other country.

Mizuna grows in almost any soil but thrives in fertile, well-drained soil with a pH of 6.0-7.0. Work in compost before planting. Light feeding with balanced fertilizer supports rapid regrowth after cutting. Avoid heavy nitrogen which can make leaves rank-tasting. Consistent moisture produces the mildest, most tender leaves. Mizuna is well-suited to container growing with quality potting mix. Raised beds provide the excellent drainage this plant appreciates.

Begin harvesting mizuna baby leaves at just 21 days after sowing, or wait 35-40 days for full-sized leaves. For cut-and-come-again harvest, cut plants 1-2 inches above the soil with scissors. Plants regrow in 10-14 days for another cutting, producing 3-4 harvests before quality declines. Alternatively, pick individual outer leaves. Harvest in the morning for crispest texture. Flavor is mildest in cool weather and intensifies slightly with heat.

Store unwashed mizuna in a plastic bag in the refrigerator for 4-5 days. The delicate leaves wilt faster than sturdier greens, so use promptly. Mizuna does not freeze or dry well for salad use. For cooking applications, blanch briefly and freeze for up to 6 months. Use in stir-fries, soups, and hot pots directly from frozen. The fast growth rate makes fresh harvesting the best preservation strategy.

Mizuna is a versatile salad green that adds gentle peppery flavor and beautiful feathery texture to mixed greens. Add to stir-fries in the last minute of cooking. Use in Japanese hot pots, miso soup, and noodle bowls. Toss into pasta for a quick wilted green. The mild flavor makes it accessible even for those who dislike bitter greens. Use as an attractive garnish for plated dishes.