Red Giant Mustard
Brassica juncea 'Red Giant'
A stunning Asian green with large, bronze-red leaves that add dramatic color to both the garden and the dinner plate. This vigorous heirloom variety provides continuous harvests of spicy, peppery leaves that mellow when cooked. Red Giant's bold appearance and robust flavor make it a favorite among adventurous gardeners and chefs.
Harvest
45-60d
Days to harvest
Sun
Full sun to partial shade
Zones
8–11
USDA hardiness
Height
12-18 inches
Planting Timeline
Showing dates for Red Giant Mustard in USDA Zone 7
All Zone 7 brassica →Zone Map
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Red Giant Mustard · Zones 8–11
Growing Details
Zone-by-Zone Planting Calendar
| Zone | Indoor Start | Transplant | Direct Sow | Harvest |
|---|---|---|---|---|
| Zone 1 | April – May | June – July | June – July | July – September |
| Zone 2 | April – May | June – July | May – July | July – September |
| Zone 11 | January – January | January – February | January – February | February – December |
| Zone 12 | January – January | January – February | January – February | February – December |
| Zone 13 | January – January | January – February | January – February | February – December |
| Zone 3 | March – April | May – June | May – June | June – October |
| Zone 4 | March – April | May – June | April – June | June – October |
| Zone 5 | February – March | April – May | April – May | June – November |
| Zone 6 | February – March | April – May | April – May | May – November |
| Zone 7 | February – March | April – May | March – May | May – November |
| Zone 8 | January – February | March – April | March – April | April – December |
| Zone 9 | January – January | February – March | February – March | March – December |
| Zone 10 | January – January | February – March | January – March | March – December |
Succession Planting
Red Giant bolts once daytime highs push consistently past 75–80°F, so your planting window is bounded by heat, not just calendar dates. Direct sow every 14–21 days starting when soil temps clear 45°F in early spring, and plan your last spring sowing around mid-April before heat ends the run. Pick back up with late-summer sowings from late August through early October for fall cuts — the leaves actually sweeten after the first light frost drops temperatures into the 30s.
The fall window is the more forgiving of the two. You have a longer runway before a hard freeze shuts things down, and flea beetle pressure drops off noticeably once nighttime temps hold below 55°F. A sowing in early October in zones 8–9 can carry you through December without much fuss.
Complete Growing Guide
Red Giant Mustard thrives in cool-season conditions and matures quickly at 45-60 days, making it ideal for spring and fall planting when temperatures stay below 70°F—bolting becomes a serious issue in summer heat. This vigorous variety prefers rich, well-draining soil with consistent moisture to prevent the leaves from becoming excessively bitter or tough. While generally pest-resistant, watch for flea beetles in early spring, which can riddle seedlings with tiny holes; floating row covers provide effective protection. Red Giant's large leaves make it somewhat prone to fungal diseases in humid conditions, so ensure good air circulation and water at soil level rather than overhead. For continuous harvests of tender leaves, succession plant every two weeks and begin picking outer leaves once plants reach 6-8 inches tall—this encourages bushier growth and delays bolting longer than waiting for full maturity.
Light: Full sun (6 or more hours of direct sunlight a day), Partial Shade (Direct sunlight only part of the day, 2-6 hours). Soil: High Organic Matter. Soil pH: Neutral (6.0-8.0). Drainage: Good Drainage, Moist. Height: 1 ft. 0 in. - 1 ft. 6 in.. Spread: 1 ft. 0 in. - 1 ft. 6 in.. Spacing: Less than 12 inches. Growth rate: Rapid. Maintenance: Medium. Regions: Coastal, Mountains, Piedmont.
Harvesting
Harvest Red Giant Mustard when the bronze-red leaves reach 6-8 inches long and display a slightly tender texture rather than becoming tough and fibrous at full maturity. The leaves are ready when they retain their deep red coloration and feel supple to the touch, typically around 45-50 days from planting. This variety supports continuous harvesting by pinching outer leaves from the base, encouraging new growth from the center, rather than cutting entire plants at once. For best results, harvest in the early morning when leaves are crisp and cool, maximizing their spicy punch if eating raw or ensuring optimal texture when cooking down their peppery bite into milder sweetness.
Long pods with round, brown seeds. The fruits will dry and split when ripe. The seeds are harvested for use in condiments and oil.
Color: Brown/Copper. Type: Siliqua.
Garden value: Edible
Edibility: The leaves, seeds, flowers, and stems of this mustard variety are edible raw or cooked. Harvested leaves can be stored in the fridge for 3-5 days.
Storage & Preservation
Fresh Red Giant leaves keep best stored unwashed in perforated plastic bags in the refrigerator crisper, maintaining quality for 5-7 days. The thick, substantial leaves hold up better than most greens, making them excellent for meal prep.
For preservation, blanch leaves in boiling water for 2 minutes, shock in ice water, drain thoroughly, and freeze in portions for up to 8 months. The robust texture survives freezing better than delicate greens. Ferment chopped leaves with salt (2% by weight) for a spicy Asian-style pickle that keeps refrigerated for months. Dehydrate young leaves at 95°F until crispy to create a peppery seasoning powder—grind dried leaves and store in airtight containers for up to a year.
History & Origin
Red Giant Mustard belongs to the diverse lineage of Asian mustard greens (Brassica juncea), which originated in the Himalayan region and became extensively cultivated throughout East Asia for millennia. While specific breeder attribution and introduction date for the 'Red Giant' cultivar remain poorly documented in readily available sources, this variety exemplifies the heirloom mustard greens tradition refined through generations of Asian seed-saving practices. The dramatic red-bronze coloring and vigorous growth habit suggest selection pressures favoring both ornamental appeal and productivity, characteristics consistent with late 20th-century vegetable breeding priorities when Asian greens experienced renewed Western gardening interest. The variety's emergence as a named cultivar likely reflects either traditional Asian seed-keeper selections or commercial seed company development during the Asian vegetable specialty crop expansion.
Origin: Russia to central Asia
Advantages
- +Striking bronze-red foliage adds dramatic visual appeal to gardens and plates.
- +Fast 45-60 day maturity allows multiple successive plantings per season.
- +Spicy peppery flavor transforms when cooked, offering versatile culinary applications.
- +Vigorous growth habit supports continuous harvesting of tender young leaves.
- +Easy cultivation makes Red Giant suitable for beginner and experienced gardeners.
Considerations
- -Highly susceptible to flea beetles, requiring consistent pest management strategies.
- -Vulnerable to multiple fungal diseases including downy mildew and white rust.
- -Peppery raw flavor may be too intense for palates preferring milder greens.
Companion Plants
Onions and garlic planted at 6-inch intervals along the bed edge disrupt the host-finding behavior of aphids and cabbage worms — both alliums release sulfur compounds that interfere with the scent cues those pests use to locate brassicas. Tagetes patula (French marigold specifically, not the big African types) pulls double duty: its root exudates suppress soil nematodes, and the flowers draw in parasitic wasps that lay eggs in caterpillar pests. Lettuce and spinach are reasonable row-mates because they share Red Giant's cool-season window without competing at the same root depth. Keep pole beans at least 3 feet away — they fix nitrogen at a rate that tends to push brassica leaves toward soft, lush growth, which aphids find irresistible.
Plant Together
Dill
Attracts beneficial insects like parasitic wasps that control cabbage worms and aphids
Onions
Repels cabbage moths, aphids, and flea beetles with strong sulfur compounds
Garlic
Natural pest deterrent against cabbage worms and root maggots
Marigolds
Repel flea beetles and cabbage worms while attracting beneficial predatory insects
Nasturtiums
Act as trap crop for aphids and flea beetles, drawing pests away from mustard
Lettuce
Provides ground cover and efficient space utilization without competing for nutrients
Carrots
Different root depths reduce competition and carrots may benefit from mustard's pest-repelling properties
Spinach
Compatible growing requirements and harvest timing, efficient garden space usage
Keep Apart
Tomatoes
Brassicas can stunt tomato growth and both attract similar pest problems
Strawberries
Mustard can inhibit strawberry growth and development through allelopathic effects
Pole Beans
Can create too much shade for mustard greens which prefer full sun exposure
Nutrition Facts
Per 100g serving. % Daily Value based on 2,000 calorie diet. Source: USDA FoodData Central (FDC #747447)
Pests & Disease Resistance
Resistance
Generally disease resistant, tolerates heat better than most mustards
Common Pests
Flea beetles, aphids, cabbage worms, harlequin bugs
Diseases
Downy mildew, white rust, black rot, clubroot
Troubleshooting Red Giant Mustard
What you'll see, why it happens, and what to do about it.
Small, irregular holes punched through leaves, especially on young seedlings in the first 2-3 weeks after germination
Likely Causes
- Flea beetles (Phyllotreta spp.) — tiny, jumping beetles that feed heavily on brassica seedlings
- Dry, warm soil conditions that stress seedlings and slow their ability to outgrow the damage
What to Do
- 1.Cover rows immediately at planting with floating row cover (Agribon-19 weight works fine) and seal the edges with soil or staples
- 2.Keep the bed consistently moist — stressed, dry seedlings take much longer to push past flea beetle pressure
- 3.If populations are heavy and the bed is uncovered, apply kaolin clay as a physical barrier every 5-7 days
Gray-purple fuzzy sporulation on the undersides of leaves, with corresponding yellow patches on the upper surface
Likely Causes
- Downy mildew (Peronospora parasitica) — most active in cool, wet weather below 65°F with poor airflow
- Overcrowded plantings where leaves stay wet for extended periods
What to Do
- 1.Strip and trash (don't compost) affected leaves as soon as you spot them
- 2.Thin plants to at least 8 inches apart to open up airflow
- 3.Switch to drip or base watering in the morning so foliage dries before nightfall
V-shaped yellow lesions on leaf edges that turn brown and papery, sometimes with a foul smell at the stem; plants wilt even when soil is moist
Likely Causes
- Black rot (Xanthomonas campestris pv. campestris) — a bacterial disease that enters through leaf margins and moves into the vascular tissue
- Infected seed or transplants, or water splash from contaminated soil
What to Do
- 1.Pull and dispose of infected plants immediately — black rot spreads fast and has no fix once it's in the vascular system
- 2.Start with certified disease-free seed and avoid working in the bed when foliage is wet
- 3.Rotate brassicas out of any affected bed for at least 2 full seasons
Frequently Asked Questions
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Red Giant vs regular mustard greens - what's the difference?▼
Growing Guides from Wind River Greens
Where to Buy Seeds
Sources & References
External authority sources used in compiling this guide.
See the Methodology page for how this data is sourced, what's AI-assisted, and known limitations.