Seed to Harvest Growing Guide

How to grow mustard

A practical guide to direct sowing or transplanting mustard, protecting broad leaves from brassica pests, and harvesting tender outer leaves repeatedly through cool weather.

Grow in cool weather for sweet leavesSpace 12–18 inches for full plantsPick outside leaves for regrowth
Shop mustard seed →Start the guide ↓
Botanical illustration showing mustard seed, seedlings, a transplant, and a mature open plant with broad blue-green leavesCrop family: Brassicaceae
Start4–6 weeks earlyOr direct sow outdoors
Depth1/4–1/2 inchKeep the mix evenly moist
LightFull sunAt least 6 hours
Spacing12–18 inchesRows 24–36 inches apart
HarvestAbout 55–85 daysOuter leaves can start sooner

Before you begin

Build the crop around repeated leaf harvests.

Mustard are non-heading brassicas that tolerate both heat and frost better than many relatives, but their sweetest, most tender leaves develop in cool weather. Plants may be direct sown or transplanted and harvested whole or cropped from the outside for weeks.

Best first decisionChoose whole-plant bunching or repeated outer-leaf harvest before spacing the bed. Full plants need 12–18 inches, while baby greens can be grown much closer.

Build your mustard-growing plan

Plan the cool window, harvest style, plant count, and first picking.

Reserve a sunny bed and time the crop so established plants produce through cool weather.

When to sow mustardFind your local planting windowEnter your ZIP code to connect workable soil, frost dates, and the cool spring or fall weather mustard prefer.Check mustard timing → Lay out the mustard bedReserve mature plant spacePlace plants in full sun with 12–18 inches between plants and 24–36 inches between rows.Plan the mustard bed → How much mustard seedCalculate the seed you needEstimate seed or transplants from bed dimensions, spacing, and harvest style.Calculate mustard seed → Keep mustard comingPlan succession sowingsStagger spring or fall plantings for overlapping baby-leaf, bunching, or outer-leaf harvests.Plan mustard successions →

Mustard at a glance

The path from seed to harvest

Select any milestone to jump directly to its full instructions.

01PlanCool spring or fall02Start4–6 weeks ahead03Transplant4–6 true leaves04GrowSteady leaf growth05ProtectScout weekly06HarvestAbout 55–85 days

Stage 1–3

Direct sow or transplant, then protect the growing point

Mustard establish readily from seed or young transplants and need room to build an open crown of broad leaves.

01

Prepare a fertile bed

Choose full sun and well-drained soil rich in organic matter.

  • Use a soil test to guide lime and fertilizer.
  • Rotate away from brassicas for disease control.
  • Plan for row cover before planting if caterpillars are common.
02

Sow indoors or outside

Sow 1/4–1/2 inch deep. Start transplants 4–6 weeks early, or direct sow once the bed is workable for a spring or fall crop.

Transplant targetMove compact plants outdoors with 4–6 mature leaves. Direct-sown seedlings can be thinned at 3–4 true leaves.
03

Harden and transplant

Gradually acclimate seedlings, then set them out about 2–3 weeks before the last spring frost.

  • Space plants 12–18 inches apart.
  • Leave 24–36 inches between rows.
  • Plant at the same depth or slightly deeper than the cell.
  • Water immediately and protect from wind.

Stage 4

Keep new leaves coming steadily

Even moisture, moderate fertility, shallow weed control, and an intact crown support repeated harvests.

W

Water evenly

Supply about 1–2 inches of water per week, including rain. Drought makes leaves tough and slows regrowth.

F

Feed by soil test

Build fertile soil before planting and side-dress as recommended, especially after repeated leaf harvests.

C

Keep roots cool

Mulch after the soil warms to conserve moisture, suppress weeds, and moderate temperature swings.

S

Scout every leaf

Look under leaves and around the crown for caterpillars, aphids, flea beetles, and disease.

Growth checkpoints

Know what to watch for.

Use leaf count, plant height, and leaf texture—not only the calendar—to judge progress.

About 5–10 days

Emergence

Seedlings appear with round cotyledons; provide strong light and even moisture.

4–6 mature leaves

Transplant ready

Harden compact plants gradually before moving them into the garden.

10–12 inches tall

First leaf harvest

Outer leaves reach useful size while the top crown remains actively growing.

Weekly in cool weather

Repeat harvest

Pick low outside leaves and always leave at least four leaves at the top.

Stage 5

Diagnose mustard problems early

Open a symptom to compare what you see, likely causes, and the next practical check.

Green imported cabbageworm on a mustard leaf with irregular chewing holes and frassPestCabbage worms and loopersRagged holes, green caterpillars, or frass on leaves

Inspect leaf undersides and the crown, handpick caterpillars, and use insect netting before moths arrive. If needed, use a labeled Bacillus thuringiensis product on small larvae.

Gray-green cabbage aphids clustered on curled young mustard leavesPestCabbage aphidsWaxy gray-green colonies on curled leaves or the crown

Check new growth and leaf undersides. Wash off small colonies, conserve beneficial insects, remove badly infested leaves, and avoid excess nitrogen.

Mustard leaf with yellow V-shaped lesions and darkened veins from black rotDiseaseBoltingYellow V-shaped lesions advancing inward from leaf margins

Remove infected plants and residue, avoid overhead irrigation and working among wet plants, rotate away from brassicas, control crucifer weeds, and begin with clean seed and transplants.

Young mustard leaf with tiny round flea beetle shot holes and a dark beetlePestFlea beetlesMany tiny round shot holes appear on young leaves

Protect seedlings immediately with insect netting, manage crucifer weeds, keep plants growing steadily, and remove covers before they trap damaging heat.

Stage 6

Pick tender outer leaves and keep the crown growing

Begin once leaves are a useful size—often under 10 inches for the most tender texture—or cut the whole young plant at 6–10 inches tall.

  1. Pick low: Remove the oldest outside leaves first with a clean knife or downward pull.
  2. Protect: Leave the stem, growing point, and at least four top leaves intact.
  3. Cool: Refrigerate promptly in a perforated bag and use within about one week.

Choose with purpose

Find the right mustard for your garden

Compare plant size, bolt resistance, winter hardiness, leaf texture, and harvest style.

Tuscan • 65 daysTendergreenDeeply savoyed blue-green to near-black leaves with rich flavor and tender young growth for salads, soups, and sautés.Shop Tendergreen → Compact hybrid • 55 daysRed GiantUniform blue-green curled leaves on compact plants, with strong cold tolerance and convenient one-cut bunching.Shop Red Giant → Tender colorful leaf • 50 daysMizuna Green OrganicFlat gray-green serrated leaves with purple stems and veins, suited to salad mix, bunching, and repeated harvest.Shop Mizuna Green Organic →

Questions gardeners ask

Mustard growing FAQ

Quick answers for timing, sowing, spacing, row cover, repeated picking, frost, harvest, and storage.

When should mustard be planted?

Plant for spring or fall, using local frost dates and variety maturity. Fall crops often give the sweetest leaves because established plants tolerate frost.

Should mustard be direct sown or transplanted?

Both work. Start transplants 4–6 weeks ahead for predictable spacing, or direct sow 1/4–1/2 inch deep and thin at 3–4 true leaves.

How deep should mustard seed be planted?

Sow 1/4–1/2 inch deep in moist seed-starting mix or finely prepared soil. Provide strong light immediately after emergence.

How far apart should mustard be spaced?

Space full plants 12–18 inches apart with rows about 24–36 inches apart. Baby-leaf crops can be much closer.

Do mustard need full sun?

Give plants at least six hours of sun. Light afternoon shade can reduce heat stress in very warm climates.

Should mustard be grown under row cover?

Early insect netting excludes cabbage moths and flea beetles when edges are sealed. Vent or remove covers before they trap heat.

Why are worms eating my mustard?

Imported cabbageworms and loopers feed on brassicas. Inspect leaf undersides, handpick larvae, and use netting or a labeled biological control while larvae are small.

Can mustard survive frost?

Established mustard tolerate frost, and cool weather often improves flavor. Protect young plants from severe freezes and check the variety’s winter hardiness.

How are mustard harvested repeatedly?

Pick the lowest outside leaves first and leave the stem, growing point, and at least four top leaves intact for regrowth.

How much water do mustard need?

Provide about 1–2 inches weekly, including rain. Uniform moisture keeps leaves tender and supports regrowth after picking.

When are mustard ready to harvest?

Harvest individual leaves once they reach useful size; leaves under about 10 inches are especially tender. Whole young plants may be cut at 6–10 inches tall.

How should harvested mustard be stored?

Cool leaves promptly and refrigerate them dry in a perforated bag. Use within about one week for best texture and flavor.

Ready to plant?

Choose mustard for your garden.

Compare maturity, plant size, bolt resistance, winter hardiness, and packet size.

Shop all mustard seed →