Mustard Seeds,
Unzen Kobu

For a spring crop, sow mustard seeds 2-4 weeks before the last expected freeze. For a fall harvest, plant seeds at the end of summer or early fall. In southern regions, you can plant mustard as late as September or October for a winter harvest. Be sure to complete the harvest before hot weather sets in, as high temperatures can cause the leaves to become tough and overly pungent. 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.'

Unzen Kobu prefers cool weather and can tolerate light freezes. For best results, plant in full sun to partial shade, 6-12 hours of sun daily, and ensure the soil is well-drained and rich in organic matter. Regular watering is essential to keep the soil consistently moist but not waterlogged.

Mustard greens need full sun to partial shade, 6-12 hours of sun daily. Maintain consistent watering, aiming for at least 1 inch of water per week. Use mulch to retain soil moisture and reduce weed growth. Fertilize with a nitrogen-rich fertilizer when the plants are 3-4 inches tall. Ensure good air circulation to prevent fungal diseases by watering at the base of the plants​​.

• Brassica juncea is capable of self pollinating, but insects can cross pollinate the flowers with other varieties of B. juncea if growing within a 2-mile radius. If saving seeds, isolate the plants from other B. juncea varieties by 2 miles.
• To save the seeds, allow pods to brown, dry, and become crispy. Shake pods into a paper bag to remove seeds. Store seeds in a cool, dark, dry location.