Japanese Red Mustard Mizuna planted in a barrel with a white background
Japanese Red Mustard Mizuna on a light background with Japanese accents.
Detail of Japanese Red Mustard Mizuna leaves with Japanese accents.
Japanese Red Mustard Mizuna growing in the greenhouses at Baker Creek.
Japanese Red Mustard Mizuna planted in a barrel with a white background
Japanese Red Mustard Mizuna on a light background with Japanese accents.
Detail of Japanese Red Mustard Mizuna leaves with Japanese accents.
Japanese Red Mustard Mizuna growing in the greenhouses at Baker Creek.

Mizuna Seeds,
Japanese Red Mustard

4.817 ReviewsSKU: #OR136Min. seed count: 200
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Description

(Brassica juncea). This peppery mustard green is beloved in Japan and commonly found in gourmet salad mix. The frilly, lace-like foliage packs loads of zippy hot flavor, and is excellent added to salads, soups, and stir fries. A reliable variety for the farmer or gardener, it can be sowed densely (1 inch apart) and harvested many times for baby greens (25 days) or thinned to 4 to 6 inches apart and allowed to mature to full size (about 3 feet). This cool season-loving green turns a deeper shade of purple when exposed to cold.

Growing Tips: Japanese Red Mustard mizuna is a hardy leafy green that prefers cooler temperatures, thriving best between 55 F and 70 F. It is well-suited for early spring and late summer planting, as it can tolerate light frosts and mild heat. The plant prefers full sun to partial shade and should be grown in nutrient-rich, well-drained soil with a pH between 6.0 and 7.5. Regular watering is essential to prevent bolting, especially in warmer weather.

Plant Details

Botanical Name
Brassica juncea
Life Cycle
Annual
Sun Requirement
6–12 hr.
Days to Germinate
5–8
Days to Maturity
40
Planting Depth
¼ in.
Plant Spacing
1–6 in.
Ideal Temperature
55–70°F
Frost Hardy
Yes

When to Grow

Plant Japanese Red Mustard mizuna in early spring or late summer to avoid the peak summer heat. This timing helps prevent bolting and ensures a continuous harvest. In milder climates, the plant can also be grown through the winter, as it is frost hardy. If using a greenhouse or cold frame, you can start sowing as early as February for an extended growing season. If you’re not sure how to find your area's first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

How to Sow and Plant

Direct sow seeds about 1/4 inch deep in the garden or in containers. Space the seeds about 1-6 inches apart. If starting indoors, plant seeds 4-6 weeks before the last frost date and transplant the seedlings outside once they are sturdy enough. The seeds typically germinate within 5-8 days when the soil temperature is between 55 F and 70 F.

How to Grow

Japanese Red Mustard mizuna requires consistent moisture to thrive. Water regularly, especially during dry periods, and consider using mulch to retain soil moisture. The plant is fast-growing. It can be sowed densely (1 inch apart) and harvested many times for baby greens (25 days) or thinned to 4-6 inches apart and allowed to mature to full size (about 36 inches mature height). For a continuous harvest, trim the outer leaves regularly or cut the whole plant back to about 1 inch above the soil, allowing it to regrow.

How to Save Seeds

  • Allow some plants to bolt and produce flowers.
  • Once the flowers have matured and the seed pods are dry, harvest the pods and store the seeds in a cool, dry place.
  • Mizuna seeds remain viable for up to four years when properly stored.

FAQ

Can Japanese Red Mustard mizuna be grown in containers?

Yes, it grows well in pots, especially when using loose, nutrient-rich soil. Ensure the container has good drainage and water regularly.

How do I prevent pests for Japanese Red Mustard mizuna?

Common pests include aphids and flea beetles. Use row covers, companion plants like garlic or mint, and organic sprays such as neem oil to manage these pests.

What is the best way to harvest Japanese Red Mustard mizuna?

Harvest when the leaves are young and tender, around 6-8 inches in length, using sharp scissors to cut them about an inch above the base for regrowth.

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