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Mighty Mustard White Gold Seeds

Scientific name Sinapis alba

About this variety

White Gold is a fast-growing mustard cover crop that shades bare soil and gathers nutrients into leafy growth. Developed through university breeding, it is grown to be chopped and returned to the soil near first flowering. Unlike clover, mustard does not fix nitrogen; it recycles nutrients already present. Timely termination keeps the stand from seeding and prepares the...

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Alliance of Native Seedkeepers  |  SKU: COV6
$200 USD

At a glance

The facts most gardeners need first

View the full variety record
250 minimum seeds per packet
Germination time

5-12 days at 65-80 F seed-zone soil temperature

  • Germination
    5-12 daysa seed-zone soil temperature of 65-80 F
  • Sun
    Full sun
  • Support and spacing
    No support needed
  • Growth habit
    Upright or erect · Annual
  • Planting season
    Spring/Fall · blooms Spring
Secure checkout Details
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Triple-tested seed qualityRegular quality and germination checks support every packet.

We regularly test seed quality and germination as lots move through storage and packing. We stand behind the seed we send and want customers to contact us when a packet does not perform as reasonably expected.

1-year seed warrantyCoverage begins on the date of purchase.

When properly stored, planted, and cared for, we guarantee reasonable germination and true-to-type growth for one year from the date of purchase. Conditions outside our control—including extreme weather, pests, unsuitable storage, and gardener error—are excluded. Contact us when something is not right so we can review the situation and work toward a replacement, refund, or another fair resolution.

Non-GMO / BE seed policyWe do not buy or sell genetically engineered or bioengineered seed.

Every seed variety we sell is non-GMO.

USDA’s National Bioengineered Food Disclosure Standard defines bioengineered foods as containing detectable genetic material modified through in vitro recombinant DNA methods in ways not achievable through conventional breeding or found in nature.

  • Hybrid means parent lines were conventionally crossed; hybrid does not mean GMO.
  • Heirloom and open-pollinated describe how a variety is maintained and reproduced.
  • Organic certification is separate and is shown only when verified for the individual product.

Read how we define heirloom, hybrid, and GMO/BE seed · USDA BE Standard

Packed in Colerain, North CarolinaPrepared in our seed room for gardens across the country.

Seeds are packed and shipped from Colerain, North Carolina. Our packets use forestry-certified paper, and we use recyclable paper mailers where appropriate. AONSK is also a 1% for the Planet partner while continuing to reduce waste in packing and fulfillment.

Garden tools

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Use the garden-fit planner and soil calculator to turn the recorded growing facts into a practical plan.

Open garden tools Uses this product’s recorded growing information. Local weather and garden conditions may vary.

Variety field guide

What to expect from Mighty Mustard White Gold Seeds

White Gold is a fast-growing mustard cover crop that shades bare soil and gathers nutrients into leafy growth.

Read the complete product descriptionTraits, flavor, garden use, variety notes, and the full catalog record

White Gold is a fast-growing mustard cover crop that shades bare soil and gathers nutrients into leafy growth. Developed through university breeding, it is grown to be chopped and returned to the soil near first flowering. Unlike clover, mustard does not fix nitrogen; it recycles nutrients already present. Timely termination keeps the stand from seeding and prepares the bed for its next crop. This small packet covers about 3 sq. ft. and is not for food or grazing.

Quick-growing cover for a small garden soil-building trial.

Growing facts

  • Botanical name: Sinapis alba
  • Maturity or display: About 35-40 days to first flowers and the usual termination window
  • Mature size: Upright leafy mustard; height depends on growth stage and management
  • Spacing: Broadcast at 8 oz per 1,000 sq ft; approximately 250 seeds cover 3 sq ft

About the variety

White Gold was developed by plant breeder Dr. Jack Brown at the University of Idaho as part of a mustard cover-crop breeding program. It is a modern selection for managed soil cover and incorporation, rather than a culinary heirloom. Any soil-pest suppression depends on the target organism and careful crop management; it is not guaranteed.

Starting seed

Broadcast in early spring or late summer; cover 1/4 in. Sprouts in 5-12 days at 65-80 F. Rate: 8 oz./1,000 sq. ft. Keep moist.

Care through the season

Sow into a prepared, firm bed with adequate fertility and moisture. Broadcast at about 8 ounces per 1,000 square feet; this approximately 250-seed packet covers about 3 square feet. Grow for soil cover and incorporation, not grazing or culinary harvest. Chop finely at first flowering, incorporate immediately, irrigate and firm the soil the same day. Wait at least three weeks and until residues have decomposed before planting the next crop.

Harvest and use

At first bloom, finely chop and immediately incorporate, water and firm soil. Wait at least 3 weeks and let residues decompose before planting. Prevent seed set.

Saving seed

Cover-crop management normally ends the stand before seed matures. Do not let routine soil-building plantings shed seed. If maintaining a dedicated seed crop, isolate it from other flowering Sinapis alba, collect mature dry pods before shattering, and dry cleaned seed thoroughly. Saved seed is for planting, not food.

Common problems

Mustard shares pests and diseases with other brassicas, so include it in crop-rotation planning. Flea beetles and caterpillars may damage young growth. Dry soil or poor fertility limits biomass. Incorporation timing, moisture and target pests affect results; do not rely on it as a guaranteed pesticide or nematode treatment.

Frequently asked questions

When is it ready?

About 35-40 days to first flowers and the usual termination window.

How should I grow it?

Sow into a prepared, firm bed with adequate fertility and moisture. Broadcast at about 8 ounces per 1,000 square feet; this approximately 250-seed packet covers about 3 square feet. Grow for soil cover and incorporation, not grazing or culinary harvest. Chop finely at first flowering, incorporate immediately, irrigate and firm the soil the same day. Wait at least three weeks and until residues have decomposed before planting the next crop.

Can I save seed?

Cover-crop management normally ends the stand before seed matures. Do not let routine soil-building plantings shed seed. If maintaining a dedicated seed crop, isolate it from other flowering Sinapis alba, collect mature dry pods before shattering, and dry cleaned seed thoroughly. Saved seed is for planting, not food.

Garden toolsOpen the garden-fit planner, planting-window questions, or soil calculator only when useful

Uses this product’s recorded growing information. Local weather, soil, and garden conditions may vary.

Garden-fit planning for this variety

Will Mighty Mustard White Gold Seeds fit your garden?

Check planting scale, season, intended harvest or soil-building purpose, and how the stand will be managed. Start with the essentials, then open only the detail groups that matter to you.

Rules-based · no AI · optional answers

Add an optional ZIP code and planting date for a broad frost-window check.Use local forecasts and measured soil temperature for final planting decisions.
1Essential fitTiming, light, and space
2Temperature and exposureOptional microclimate detail
3Soil, drainage, and waterRoot-zone readiness
4Questions for this grain or cover-crop seedCrop-specific decisions
5Seed-starting fit and patienceMatch the propagation work
Soil test, pH, drainage, and amendment calculator Have a laboratory soil report? Enter pH, nutrients, texture, bed size, and site observations here. Open soil tools
Recorded soil typeLoamy
Recorded pH range6.0–6.5
Water needsModerate
LightFull sun

Laboratory report interpreter

Soil readiness for Mighty Mustard White Gold Seeds

Sinapis alba

Enter only the values your report provides. The result compares them with this crop’s recorded needs and keeps laboratory recommendations authoritative.

Core report valuesStart here
Advanced laboratory valuesOptional method-aware detail

Full growing record

Complete growing and seedkeeping record

Starting and plantingSeed preparation, sowing, germination, transplanting, spacing, and early establishment
Broadcast in early spring or late summer; cover 1/4 in. Sprouts in 5-12 days at 65-80 F. Rate: 8 oz./1,000 sq. ft. Keep moist.

Sow into a prepared, firm bed with adequate fertility and moisture. Broadcast at about 8 ounces per 1,000 square feet; this approximately 250-seed packet covers about 3 square feet. Grow for soil cover and incorporation, not grazing or culinary harvest. Chop finely at first flowering, incorporate immediately, irrigate and firm the soil the same day. Wait at least three weeks and until residues have decomposed before planting the next crop.
Season-long growing guideWater, fertility, support, weather response, pollination, containers, and care through maturity
Broadcast in early spring or late summer; cover 1/4 in. Sprouts in 5-12 days at 65-80 F. Rate: 8 oz./1,000 sq. ft. Keep moist.
Harvest, storage, and usesRecognizing maturity, harvesting cleanly, handling and storage, kitchen uses, and garden roles

Harvest and storage

At first bloom, finely chop and immediately incorporate, water and firm soil. Wait at least 3 weeks and let residues decompose before planting. Prevent seed set.

Cover-crop management normally ends the stand before seed matures. Do not let routine soil-building plantings shed seed. If maintaining a dedicated seed crop, isolate it from other flowering Sinapis alba, collect mature dry pods before shattering, and dry cleaned seed thoroughly. Saved seed is for planting, not food.

Uses and garden roles

White Gold is a fast-growing mustard cover crop that shades bare soil and gathers nutrients into leafy growth. Developed through university breeding, it is grown to be chopped and returned to the soil near first flowering. Unlike clover, mustard does not fix nitrogen; it recycles nutrients already present. Timely termination keeps the stand from seeding and prepares the bed for its next crop. This small packet covers about 3 sq. ft. and is not for food or grazing.

At first bloom, finely chop and immediately incorporate, water and firm soil. Wait at least 3 weeks and let residues decompose before planting. Prevent seed set.
Seed savingSelection, pollination, isolation, full maturity, cleaning, drying, labeling, and storage
Cover-crop management normally ends the stand before seed matures. Do not let routine soil-building plantings shed seed. If maintaining a dedicated seed crop, isolate it from other flowering Sinapis alba, collect mature dry pods before shattering, and dry cleaned seed thoroughly. Saved seed is for planting, not food.
Pests, diseases, and troubleshootingPrevention, diagnosis, environmental disorders, common damage, and first-response checks
Mustard shares pests and diseases with other brassicas, so include it in crop-rotation planning. Flea beetles and caterpillars may damage young growth. Dry soil or poor fertility limits biomass. Incorporation timing, moisture and target pests affect results; do not rely on it as a guaranteed pesticide or nematode treatment.
Frequently asked questionsDecision-focused answers that supplement the detailed guides above
When is it ready?
About 35-40 days to first flowers and the usual termination window.

How should I grow it?
Sow into a prepared, firm bed with adequate fertility and moisture. Broadcast at about 8 ounces per 1,000 square feet; this approximately 250-seed packet covers about 3 square feet. Grow for soil cover and incorporation, not grazing or culinary harvest. Chop finely at first flowering, incorporate immediately, irrigate and firm the soil the same day. Wait at least three weeks and until residues have decomposed before planting the next crop.

Can I save seed?
Cover-crop management normally ends the stand before seed matures. Do not let routine soil-building plantings shed seed. If maintaining a dedicated seed crop, isolate it from other flowering Sinapis alba, collect mature dry pods before shattering, and dry cleaned seed thoroughly. Saved seed is for planting, not food.
History and provenanceBotanical identity, cultivar history, regional or cultural context, uncertainty, and source records

Scientific name: Sinapis alba

White Gold was developed by plant breeder Dr. Jack Brown at the University of Idaho as part of a mustard cover-crop breeding program. It is a modern selection for managed soil cover and incorporation, rather than a culinary heirloom. Any soil-pest suppression depends on the target organism and careful crop management; it is not guaranteed.

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