Mizuna Seeds,
Japanese Red Mustard

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.'

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.

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.

• 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.