Mizuna Microgreens
Brassica rapa var. japonica
Traditional brassica green of Japanese origin prized for its quick growth, productivity, mild flavor, and recognizable, serrated leaf shape. USDA Certified Organic.
Harvest
7-14d
Days to harvest
Sun
Indirect light
Zones
5–11
USDA hardiness
Height
3 feet
Planting Timeline
Showing dates for Mizuna Microgreens in USDA Zone 7
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Mizuna Microgreens · Zones 5–11
Growing Details
Zone-by-Zone Planting Calendar
| Zone | Indoor Start | Transplant | Direct Sow | Harvest |
|---|---|---|---|---|
| Zone 3 | January – December | — | — | January – December |
| Zone 4 | January – December | — | — | January – December |
| Zone 5 | January – December | — | — | January – December |
| Zone 6 | January – December | — | — | January – December |
| Zone 7 | January – December | — | — | January – December |
| Zone 8 | January – December | — | — | January – December |
| Zone 9 | January – December | — | — | January – December |
| Zone 10 | January – December | — | — | January – December |
Complete Growing Guide
Growing mizuna microgreens is one of the most rewarding experiences for new microgreen growers, offering quick results with minimal fuss. Start by soaking your mizuna seeds for 4-8 hours in room temperature water—this softens the seed coat and ensures even germination within 2-3 days instead of the usual 4-5.
For your growing medium, use coconut coir, peat-based mixes, or hemp mats rather than traditional potting soil. These provide excellent drainage while retaining just enough moisture for the shallow root systems. Fill your growing tray to about 1/2 inch depth, creating a level surface that prevents water pooling.
Broadcast seeds evenly across the surface at a density of about 1 tablespoon per 10x20 inch tray—mizuna needs slightly more space than other microgreens to develop its characteristic feathery leaves. Lightly press seeds into the medium and cover with a thin layer of growing medium or use a blackout dome for the first 2-3 days to encourage strong stem development.
Misting is critical during the first week. Use a fine spray bottle 2-3 times daily, keeping the surface consistently moist but never waterlogged. Once cotyledons appear (usually day 3-4), switch to bottom watering by adding water to your collection tray—this prevents damping-off disease that mizuna is susceptible to when leaves stay wet.
Provide 12-16 hours of indirect light or LED grow lights positioned 12-18 inches above the trays. Mizuna microgreens stretch toward light sources, so rotate trays daily for even growth. Maintain temperatures between 65-75°F for optimal growth—cooler temperatures slow germination while heat above 80°F can cause bitter flavors.
Avoid overwatering, which causes the fuzzy white mold that beginners often mistake for root hairs. Ensure good air circulation with a small fan if growing in enclosed spaces. The biggest mistake new growers make is harvesting too early—wait until true leaves just begin forming for the best flavor balance between mild pepper and subtle sweetness.
To maximize yields, succession plant new trays every 4-5 days. Mizuna doesn't regrow well after cutting, unlike some microgreens, so focus on continuous new plantings rather than trying to get multiple harvests from one tray.
Harvesting
Harvest mizuna microgreens when they reach 1-2 inches tall with fully developed cotyledons and the first true leaves just beginning to emerge, typically 10-14 days from seeding. The leaves should display their characteristic serrated, feathery edges and maintain a vibrant green color with no yellowing at the tips.
The visual sweet spot occurs when cotyledons are fully expanded but before true leaves dominate—at this stage, you'll get mizuna's signature mild peppery flavor without the stronger mustard bite that develops in mature plants. Perform a taste test by sampling a few microgreens; they should have a crisp texture with a gentle spicy finish.
Harvest in the morning when plants are fully hydrated and crisp. Use clean, sharp scissors or a harvest knife to cut about 1/2 inch above the growing medium, avoiding the root zone to prevent contamination. Cut in small sections rather than trying to harvest entire trays at once, which can damage nearby plants. Rinse gently in cool water only if necessary—properly grown mizuna microgreens should be clean enough to eat without washing, which helps preserve their delicate texture and extends shelf life.
Storage & Preservation
Fresh mizuna microgreens stay crisp for 5-7 days when stored properly in the refrigerator at 35-40°F with 95% humidity. Place harvested greens in perforated plastic bags or containers lined with barely damp paper towels—too much moisture causes rapid deterioration, while too little leads to wilting within 24 hours.
For immediate use within 2-3 days, store in the refrigerator crisper drawer in breathable containers. Avoid airtight storage, which traps ethylene gas and accelerates decay.
Mizuna microgreens freeze poorly due to their high water content and delicate cell structure, becoming mushy when thawed. Instead, preserve them through gentle dehydration at 95°F for 6-8 hours to create crispy garnishes with concentrated flavor. The dried microgreens work well mixed into herb salts or seasoning blends.
For extending fresh use, consider succession planting rather than preservation—with their 10-14 day growing cycle, you can have fresh harvests available continuously rather than dealing with storage challenges.
History & Origin
Mizuna (Brassica rapa var. nipposinica) originates from the Kansai region of Japan, where it has been cultivated since the Heian period (794-1185). The name 'mizuna' translates to 'water vegetable,' reflecting its traditional cultivation in the flooded rice paddies of Kyoto during winter months when the fields were otherwise unused.
Japanese farmers developed mizuna as a hardy winter green that could withstand light frosts while providing fresh vegetables during the cold season. The plant's deeply serrated leaves and mild flavor made it a staple in traditional Japanese cuisine, particularly in hot pot dishes and pickled preparations.
Mizuna remained largely unknown outside Japan until the 1980s, when specialty seed companies began importing varieties for Western markets. The microgreen cultivation of mizuna is an even more recent development, emerging in the 1990s as chefs discovered that the young cotyledons retained the plant's signature mild peppery flavor while offering exceptional visual appeal.
Today, mizuna microgreens represent a perfect fusion of ancient Japanese agricultural wisdom and modern controlled-environment growing techniques, allowing year-round production of this historically seasonal crop.
Advantages
- +Extremely fast germination in just 2-3 days with proper seed soaking
- +Virtually pest-free when grown indoors, unlike many other microgreen varieties
- +Distinctive feathery, serrated leaves create exceptional visual appeal as garnish
- +Mild peppery flavor appeals to those who find other mustard greens too strong
- +Tolerates slight temperature fluctuations better than most Asian microgreens
- +Excellent shelf life of 5-7 days when properly stored
- +High germination rates of 85-90% even with standard quality seeds
Considerations
- -More susceptible to damping-off disease than hardier microgreens like radish or pea
- -Cannot be regrown after harvest, requiring continuous succession planting
- -Seeds require soaking time, adding an extra step compared to direct-sow varieties
- -More expensive seeds compared to common microgreens like broccoli or alfalfa
- -Delicate leaves bruise easily during harvesting and handling
Companion Plants
Plant Together
Chives
Repels aphids and flea beetles that commonly attack brassicas
Dill
Attracts beneficial insects and can improve flavor of nearby greens
Lettuce
Compatible growing conditions and similar harvest timing for microgreens
Radish
Fast-growing companion that can be harvested alongside mizuna microgreens
Cilantro
Similar light and moisture requirements, compatible for mixed microgreen trays
Arugula
Both are brassicas with similar growing needs and complementary flavors
Pea Shoots
Compatible growth rates and can add nitrogen to growing medium
Nasturtium
Acts as trap crop for flea beetles and aphids that target brassicas
Keep Apart
Fennel
Produces allelopathic compounds that inhibit growth of brassicas
Strawberry
May compete for nutrients and has different moisture requirements
Tomato
Can stunt growth of brassica family plants through root competition
Nutrition Facts
Per 100g serving. % Daily Value based on 2,000 calorie diet. Source: USDA FoodData Central (FDC #167782)
Pests & Disease Resistance
Resistance
Generally disease-free when grown as microgreens
Common Pests
Minimal pest issues indoors, occasional aphids
Diseases
Damping-off if overwatered, mold in poor ventilation
Frequently Asked Questions
How long do mizuna microgreens take to grow?▼
Do mizuna microgreens need to be soaked before planting?▼
What do mizuna microgreens taste like?▼
Can you regrow mizuna microgreens after cutting?▼
Why are my mizuna microgreens getting moldy?▼
Are mizuna microgreens good for beginners?▼
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