How to Grow Giant Mustard
Wikimedia Commons
Giant Mustard
Brassica juncea
vegetableGiant mustard is a robust leafy green vegetable known for its large, crinkled leaves and peppery flavor. It grows quickly in cool seasons and can reach impressive sizes, making it ideal for both fresh eating and cooking. This Asian brassica is highly nutritious and versatile in the kitchen.
Looking for a specific variety?
When should you plant Giant Mustard in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Giant Mustard timeline · Pittsburgh, PA (Zone 6b)
-
Plant Giant Mustard
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Giant Mustard
Around Jun 1≈ 45 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Giant Mustard dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 4-8; grows best in cool seasons (fall, spring, and winter in mild climates)
Sign up free to see if Giant Mustard grows in your zone — and get a personalized planting timeline.
Get my Giant Mustard timeline →Growth Stages
Seedling
7-10 daysSmall cotyledons emerge, followed by the first true leaves with characteristic mustard shape
Keep soil moist; provide bright light; thin seedlings to proper spacing once first true leaves appear
Vegetative Growth
20-30 daysPlant develops multiple large, deeply-lobed leaves; foliage becomes more prominent and frilly
Water consistently; apply balanced fertilizer every 2-3 weeks; remove any damaged or yellowing leaves
Leaf Expansion
10-20 daysLeaves reach full size and develop intense green color with pronounced texture; plant becomes increasingly bushy
Continue regular watering; fertilize if growth slows; monitor for pests; harvest outer leaves as needed
Peak Growth
5-10 daysPlant reaches mature size with abundant large, harvestable leaves at prime tenderness and flavor
Begin harvesting outer leaves; maintain moisture; watch for bolting in warm weather
Harvest/Bolting
VariablePlant transitions to flowering stage if temperatures rise or day length increases; flower buds may form
Harvest remaining leaves promptly; remove plant if bolting occurs; can harvest seed pods if desired
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Row covers on young plants; kaolin clay spray; neem oil; remove debris; ensure adequate moisture
-
Bt (Bacillus thuringiensis); hand-pick larvae; row covers; encourage natural predators
-
Strong water spray; insecticidal soap; neem oil; introduce beneficial insects like ladybugs
-
Hand-pick bugs and egg clusters; row covers; kaolin clay; diatomaceous earth; remove crop residue
-
Yellow sticky traps; insecticidal soap; neem oil; encourage parasitic wasps
Uses
Stir-fries and cooked greens
CulinaryGiant mustard is prized in Asian cuisines for stir-frying, braising, and sautéing. Its peppery flavor becomes milder when cooked, making it versatile in numerous dishes from simple side dishes to complex stir-fries with garlic, ginger, and soy sauce. [source]
Fresh salads and raw preparations
CulinaryYoung, tender leaves can be eaten raw in salads for a peppery kick, or mixed with milder greens. The distinctive flavor and texture add interest to simple green salads and Asian salad preparations. [source]
Nutritional and anti-inflammatory benefits
MedicinalGiant mustard is rich in glucosinolates, vitamins K, C, and A, and compounds with anti-inflammatory properties. Traditional medicine systems have used mustard greens to support digestion and overall wellness. [source]
Condiment production
HouseholdSeeds from bolting plants can be harvested and ground into mustard powder or prepared as mustard condiments. This allows gardeners to produce homemade mustard products from seed to finished condiment. [source]
Pollinator and beneficial insect support
WildlifeWhen allowed to bolt and flower, giant mustard produces attractive yellow flowers that attract pollinators, butterflies, and beneficial insects. The flowering stage can serve as a cover crop benefit in garden rotations. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Begin harvesting outer leaves when 4-6 inches long, typically 30-40 days after planting; harvest continuously by picking outer leaves, allowing inner leaves to continue growing; harvest in the morning for best crispness and flavor; plants are most tender and mild before temperatures reach 75°F; cut leaves at the base with a sharp knife; do not harvest more than one-third of the plant at once to maintain vigor
Fun Facts
- 🌱 Giant mustard (Brassica juncea) is thought to have originated in the Himalayan region and has been cultivated for over 3,000 years, making it one of the world's oldest cultivated vegetables.
- 🌱 The peppery heat in mustard greens comes from glucosinolates, compounds that are activated when the leaves are cut or chewed, similar to the heat in wasabi and horseradish.
- 🌱 A single giant mustard plant can produce enough leaves to feed a family for weeks through continuous harvesting, making it one of the most productive leaf crops for small garden spaces.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Giant Mustard planting timeline
Tell us your zip code and we'll calculate exactly when to start Giant Mustard seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Giant Mustard timeline →