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Mustard Seeds, Japanese Giant Red
Description
(Brassica juncea). Beautiful, large Japanese type. Purple red leaves with a delicious, strong, sharp, almost garlic-like, mustard flavor. Tasty stir fried or boiled, and makes a great pickling variety.
- 40 days to maturity
- 6-12 hours of sun
- Sprouts in 5-8 days
- Seed Depth: 1/4"
- Plant Spacing: 12"
- Ideal Temperature: 55-70 F
- Frost Hardy: Yes
Growing Tips, Tricks and FAQs
Growing Tips
Japanese Giant Red mustard thrives in well-drained, fertile soil with a pH between 6.0 and 7.5. It prefers a sunny spot, 6-12 hours of sun a day, though it can tolerate partial shade, especially in warmer climates. Regular watering is crucial to keep the soil moist, as dry conditions can cause the leaves to develop a bitter taste​.
When to Grow
Plant Japanese Giant Red mustard greens during the cool seasons of spring and fall. In regions without killing freezes, they can be grown throughout winter. Sow seeds 4-6 weeks before the last expected freeze in spring, or 4-6 weeks before the first expected freeze in fall. For specific freeze dates, refer to a planting zone guide for your area. The ideal temperature for Japanese Giant Red mustard is 55-70 degrees F.
How to Sow and Plant
Sow seeds directly into the garden 1/4 inch deep and 2-3 inches apart. For a continuous harvest, sow additional seeds every 3 weeks. If starting indoors, transplant seedlings when they have at least two true leaves. Space plants about 12 inches apart to allow for mature growth​​.
How to Grow
Maintain consistent soil moisture and provide moderate fertilization, particularly nitrogen-rich options to encourage leafy growth. Mulch around plants to retain moisture and suppress weeds. Mustard greens grow quickly and can be harvested as baby greens or allowed to mature for larger leaves. Regular harvesting encourages continued growth.
How to Save
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 dry pods into a paper bag to remove seeds. Store seeds in a cool, dark, dry location.
FAQ
How long does it take for Japanese Giant Red mustard to mature?
Japanese Giant Red mustard matures in about 40 days, depending on the planting season.
Can Japanese Giant Red be grown in containers?
Yes, mustard greens grow well in containers. But make sure that the container is at least 6 inches deep and keep the soil consistently moist​.
How often should Japanese Giant Red be watered?
Keep the soil moist. In hot climates, you may need to water twice a day.
What kind of fertilizer is best for Japanese Giant Red?
Use a balanced vegetable fertilizer. High nitrogen levels support leafy growth, while moderate phosphorus and potassium are also beneficial​​.
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