Red Mizuna

A beautiful purple-red variety of Japanese mustard green with deeply serrated leaves and a peppery, slightly sweet flavor. Grows quickly in cool weather and can be harvested as baby greens in just three weeks or left to mature. Plants form attractive rosettes that add color to salad mixes and garden beds alike. Tolerates light frost well and actually tastes sweeter after cold exposure.

Direct sow is preferred as mizuna dislikes transplanting. Sow seeds one-quarter inch deep in moist soil from early spring through early fall. Germination takes 4 to 7 days at 50 to 75 degrees. For earliest spring crops, start indoors in cell trays 3 to 4 weeks before last frost and transplant gently. Thin seedlings to 4 to 6 inches for full plants or grow closer for baby leaf cuts.

Red mizuna is a fast-growing Japanese mustard green with deeply serrated, burgundy-tinged leaves and a mild peppery flavor. Direct sow seeds one-quarter inch deep in prepared soil from early spring through fall, spacing 4 to 6 inches apart in rows 12 inches apart. Seeds germinate quickly in 4 to 7 days at 50 to 75 degrees Fahrenheit.

Red mizuna thrives in cool weather but tolerates heat better than many salad greens. Provide consistent moisture and partial shade during hot weather to prevent bolting and bitterness. Succession sow every 2 to 3 weeks for a continuous supply of tender baby leaves.

For baby leaf harvest, cut plants at 3 to 4 inches tall just above the growing point, and they will regrow for multiple harvests. For full-sized plants, allow 40 to 50 days to maturity. Feed lightly with nitrogen-rich fertilizer every 2 weeks. Red mizuna is excellent for container growing and makes a beautiful addition to ornamental edible gardens.

Red mizuna grows well alongside lettuce, spinach, and other salad greens in mixed beds. Radishes planted nearby help deter flea beetles. Taller plants like tomatoes or beans provide beneficial afternoon shade in hot weather. Avoid planting near other brassicas to reduce shared pest problems.

Red mizuna grows well in fertile, well-drained soil with a pH between 6.0 and 7.0. Work in 1 to 2 inches of compost before sowing. Light feeding with nitrogen-rich fertilizer every 2 weeks promotes lush, tender growth. Avoid heavy fertilization which can reduce the intensity of the red coloration. Container plants benefit from regular liquid feeding.

Ideal Temperature

Hardiness Zone Compatibility

For baby greens, begin cutting leaves when plants are 3 to 4 inches tall, about 20 to 25 days after sowing. Cut just above the growing point with scissors, leaving the base to regrow for 2 to 3 additional harvests. For full-sized plants, harvest outer leaves individually or cut the entire rosette at 40 to 50 days. Red color is most intense in cool weather and bright light.

Storage & Preservation

Fresh red mizuna stores for 5 to 7 days in the refrigerator in a sealed container lined with paper towel. It is best eaten fresh in salads where its color and mild peppery flavor shine. Red mizuna does not freeze or dry well due to its delicate texture. Grow year-round in succession for a constant fresh supply rather than preserving.

Troubleshooting Common Problems

Bolting in hot weather is the main challenge, causing leaves to become bitter and tough. Flea beetles can devastate young seedlings if not protected. The red color fades in excessive heat or shade. Overcrowding produces spindly plants with weak color development. Slugs are particularly attracted to the tender young leaves.

Growing Tips

1. Succession sow every 2-3 weeks from early spring through autumn for a non-stop supply of tender leaves. Red mizuna grows so quickly that a new sowing reaches baby leaf stage before the previous one finishes, ensuring you never run out of fresh greens.
2. For the most vivid red-purple coloring, grow in full sun during cool weather (below 18°C / 65°F). The anthocyanin pigments that produce the red color are stimulated by UV light exposure and cool temperatures — shaded or warm-grown plants will be more green than red.
3. Use cut-and-come-again harvesting to maximize production. Cut leaves 2-3 cm above the soil line with clean scissors, leaving the growing crown intact. New leaves will regrow within 7-10 days. Each plant can handle 4-6 rounds of harvesting before quality declines.
4. Red mizuna makes an exceptional companion plant — its rapid growth and shallow roots make it ideal for interplanting between slow-growing crops like tomatoes, peppers, or brassicas. It acts as a living mulch, shading the soil and suppressing weeds while you harvest salad greens.
5. For winter growing, red mizuna is one of the best candidates for unheated cold frames and low tunnels. It survives hard frost down to -6°C (21°F) and continues slow growth through winter, providing fresh greens when little else is available from the garden.
6. Grow red mizuna as microgreens for the fastest harvest of all — seeds sprout in 2-3 days and microgreens are ready to cut at 10-14 days. Sow densely on a thin layer of potting mix in a shallow tray and harvest when cotyledons are fully open with the first true leaf emerging.
7. Protect young plants from flea beetles, which can riddle leaves with tiny holes. Lightweight row cover (insect netting) is the most effective organic control — install it at sowing time and leave it in place until plants are large enough to tolerate minor damage.
8. Avoid heavy nitrogen fertilization, which produces lush but bland-tasting leaves with muted red coloring. A light application of balanced compost at planting time and a diluted liquid feed every 2-3 weeks is all red mizuna needs for optimal flavor and color.