How to Grow Mustard Greens
Brassica juncea
The fastest, spiciest cool-season green — from seed to harvest in as little as 45 days.
By the Plants by Zone Editorial Team · Reviewed June 1, 2026
About mustard greens
Mustard greens are a fast-growing cool-season brassica prized for their peppery, slightly sharp leaves — a staple of Southern US cooking, Indian cuisine, and Asian stir-fries. They mature in as little as 45 days, tolerate frost beautifully, and can be harvested as tender baby leaves or grown to full size for braising. Like all brassicas they bolt in heat, so spring and fall are their seasons, but a cool snap before harvest actually sweetens the flavor noticeably.
When to plant and harvest mustard greens
Timing is relative to your frost dates. Find your USDA zone for exact dates, or browse the month-by-month calendars.
Start seeds indoors
Optional — 3–4 weeks before last frost
Transplant outdoors
2–4 weeks before last frost
Direct sow
2–4 weeks before last frost; again in late summer 6–8 weeks before first frost for fall
Harvest
Spring and fall
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How to grow mustard greens step by step
- 1
Direct-sow ¼–½ in deep into fertile, moist soil 2–4 weeks before the last frost — mustard germinates in days even in cool soil.
- 2
Thin seedlings to 4–6 in for baby-leaf harvest, or to 12 in for large, full-size heads.
- 3
Keep evenly moist throughout the season; uneven watering produces tough, overly sharp leaves.
- 4
Begin harvesting outer leaves as soon as they reach usable size using the cut-and-come-again method — this keeps one sowing producing for weeks.
- 5
Sow again in late summer 6–8 weeks before your first fall frost for a second full harvest sweetened by autumn cool.
- 6
Pull plants the moment a flower stalk appears — bolted mustard turns unpleasantly bitter almost overnight.
Common problems growing mustard greens
⚠ Rapid bolting in heat
Mustard bolts quickly in warm weather and long days — grow it strictly in spring and fall, and choose slow-bolt varieties like 'Southern Giant Curled' or 'Florida Broadleaf' for the longest harvest window.
⚠ Flea beetles peppering the leaves
Cover seedlings with floating row cover immediately after sowing; flea beetles are most active in warm, dry spells and inflict the worst damage on young transplants.
⚠ Leaves are too hot or bitter
Harvest young leaves (under 4 inches) for the mildest flavor, and grow in genuinely cool weather — heat dramatically intensifies the mustard oils that give the leaves their heat.
⚠ Aphids and cabbage worms
Check leaf undersides for eggs and caterpillars and hand-pick; use row cover as the simplest prevention. A firm blast of water dislodges aphid colonies.
✓ Good companions for mustard greens
✗ Keep away from
🧺 Harvesting mustard greens
Pick the outer leaves first and let the center keep growing for a steady supply over weeks, or cut the whole plant 2 inches above the soil and it will flush a second growth. Young leaves (under 4 inches) are mild enough to add raw to salads and slaws; larger leaves develop more heat and are best braised with garlic and onion, wilted into soups, or stir-fried briefly. Harvest in the cool of the morning when leaves are most crisp. A light frost before picking noticeably sweetens the leaves — time a fall crop to catch it.
Mustard Greens: frequently asked questions
When should you plant mustard greens?＋
In most regions you start seeds indoors optional — 3–4 weeks before last frost, then transplant 2–4 weeks before last frost — or direct sow 2–4 weeks before last frost; again in late summer 6–8 weeks before first frost for fall. Timing is relative to your last frost, so find your USDA hardiness zone for the exact planting dates where you live.
Can I eat mustard greens raw?＋
Yes — young, tender leaves under 4 inches are mild enough to eat raw and add a pleasant peppery kick to salads and slaws. Larger or more mature leaves carry more heat and are best cooked, which mellows the sharpness significantly.
How do mustard greens differ from kale or spinach?＋
Mustard greens have a distinctly sharp, peppery bite from the mustard oils they contain — quite different from the mild earthiness of kale or the gentle flavor of spinach. They are also considerably faster to mature (45–60 days vs. 50–65+ for kale), making them one of the quickest leafy greens you can grow from seed.
Sources & review
Written and maintained by the Plants by Zone Editorial Team. Planting times are based on USDA hardiness zones and NOAA frost-date normals, with care guidance drawn from Cooperative Extension sources. Last reviewed June 1, 2026.
USDA Plant Hardiness Zone MapNOAA U.S. climate normalsCooperative Extension
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