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Miike Giant Mustard Seeds

Scientific name Brassica juncea

About this variety

Miike Giant makes a broad, substantial mustard leaf with reddish veins and a lively blend of sweetness and heat. Cool weather can deepen its purple tones, adding color to a productive patch of greens. The loose heads suit gradual picking, from tender salad leaves to larger foliage for soups, stir-fries and pickles. Give this generous Japanese mustard room...

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Alliance of Native Seedkeepers  |  SKU: OR24
$200 USD

Pickup available at Bertie County Seeds

Usually ready in 2-4 days

At a glance

The facts most gardeners need first

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

4-10 days at 55-70 F seed-zone soil temperature

  • Germination
    4-10 daysa seed-zone soil temperature of 55-70 F
  • Sun
    Full - Partial Sun
  • Support and spacing
    No support needed · space 8 in · rows 18 in
  • Growth habit
    Rosette · Annual
  • Planting season
    Spring/Fall · blooms Spring · Hardy
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 Miike Giant Mustard Seeds

Miike Giant makes a broad, substantial mustard leaf with reddish veins and a lively blend of sweetness and heat.

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

Miike Giant makes a broad, substantial mustard leaf with reddish veins and a lively blend of sweetness and heat. Cool weather can deepen its purple tones, adding color to a productive patch of greens. The loose heads suit gradual picking, from tender salad leaves to larger foliage for soups, stir-fries and pickles. Give this generous Japanese mustard room to spread, and harvest steadily while leaves are tender and growth is vigorous.

Broad, colorful leaves with a sweet mustard bite.

Growing facts

  • Botanical name: Brassica juncea
  • Maturity or display: 40-50 days
  • Mature size: 12-18 in. leafy growth
  • Spacing: 8 in between plants; rows 18 in

About the variety

Miike Giant is an open-pollinated Japanese mustard with loosely headed growth and ruby-veined foliage. Leaf color and pungency vary with the season and growing conditions.

Starting seed

Direct sow 1/2 in. deep in spring or late summer for a cool-weather harvest. Keep moist at 55-70 F; allow about 4-10 days to sprout. Thin to 8 in. apart, rows 18 in. apart. Choose sun and fertile, well-drained soil; water steadily and protect seedlings from flea beetles.

Care through the season

Maintain even moisture and remove weeds while small. Rotate brassica beds and use insect netting before flea beetles or caterpillars arrive. Grow for a cool harvest; heat and drought promote bitter leaves and premature flowering.

Harvest and use

Pick young outer leaves for salads, then larger leaves for cooking around 40-50 days from sowing. Leave the center growing or cut the full plant before bolting. Refrigerate promptly. Save seed from isolated healthy plants; collect and dry ripe pods before threshing.

Saving seed

These open-pollinated brassicas are insect-pollinated. Keep several healthy, typical plants for seed and prevent crossing with other flowering varieties of the same species. Some plants need a cold period before flowering. Let pods mature, then cut and dry them under cover before they shatter; clean, label and store seed cool and dry.

Common problems

Check young leaves for flea beetle holes, aphids and caterpillars. Use row covers early, inspect regularly, and remove badly diseased plants. Crop rotation, drainage and steady watering help limit root disease and stress. A flowering stem means the leafy harvest is ending; use the leaves promptly.

Frequently asked questions

Does it form a tight head?

Miike Giant makes a broad, substantial mustard leaf with reddish veins and a lively blend of sweetness and heat.

When should I harvest?

Pick young outer leaves for salads, then larger leaves for cooking around 40-50 days from sowing. Leave the center growing or cut the full plant before bolting. Refrigerate promptly. Save seed from isolated healthy plants; collect and dry ripe pods before threshing.

Why is it flowering early?

Maintain even moisture and remove weeds while small. Rotate brassica beds and use insect netting before flea beetles or caterpillars arrive. Grow for a cool harvest; heat and drought promote bitter leaves and premature flowering.

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 Miike Giant Mustard Seeds fit your garden?

Check cool-season timing, transplant plans, heat pressure, soil moisture, and harvest goal. 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 cool-season vegetable 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 - Partial Sun

Laboratory report interpreter

Soil readiness for Miike Giant Mustard Seeds

Brassica juncea

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
Direct sow 1/2 in. deep in spring or late summer for a cool-weather harvest. Keep moist at 55-70 F; allow about 4-10 days to sprout. Thin to 8 in. apart, rows 18 in. apart. Choose sun and fertile, well-drained soil; water steadily and protect seedlings from flea beetles.

Maintain even moisture and remove weeds while small. Rotate brassica beds and use insect netting before flea beetles or caterpillars arrive. Grow for a cool harvest; heat and drought promote bitter leaves and premature flowering.
Season-long growing guideWater, fertility, support, weather response, pollination, containers, and care through maturity
Direct sow 1/2 in. deep in spring or late summer for a cool-weather harvest. Keep moist at 55-70 F; allow about 4-10 days to sprout. Thin to 8 in. apart, rows 18 in. apart. Choose sun and fertile, well-drained soil; water steadily and protect seedlings from flea beetles.
Harvest, storage, and usesRecognizing maturity, harvesting cleanly, handling and storage, kitchen uses, and garden roles

Harvest and storage

Pick young outer leaves for salads, then larger leaves for cooking around 40-50 days from sowing. Leave the center growing or cut the full plant before bolting. Refrigerate promptly. Save seed from isolated healthy plants; collect and dry ripe pods before threshing.

These open-pollinated brassicas are insect-pollinated. Keep several healthy, typical plants for seed and prevent crossing with other flowering varieties of the same species. Some plants need a cold period before flowering. Let pods mature, then cut and dry them under cover before they shatter; clean, label and store seed cool and dry.

Uses and garden roles

Miike Giant makes a broad, substantial mustard leaf with reddish veins and a lively blend of sweetness and heat. Cool weather can deepen its purple tones, adding color to a productive patch of greens. The loose heads suit gradual picking, from tender salad leaves to larger foliage for soups, stir-fries and pickles. Give this generous Japanese mustard room to spread, and harvest steadily while leaves are tender and growth is vigorous.

Pick young outer leaves for salads, then larger leaves for cooking around 40-50 days from sowing. Leave the center growing or cut the full plant before bolting. Refrigerate promptly. Save seed from isolated healthy plants; collect and dry ripe pods before threshing.
Seed savingSelection, pollination, isolation, full maturity, cleaning, drying, labeling, and storage
These open-pollinated brassicas are insect-pollinated. Keep several healthy, typical plants for seed and prevent crossing with other flowering varieties of the same species. Some plants need a cold period before flowering. Let pods mature, then cut and dry them under cover before they shatter; clean, label and store seed cool and dry.
Pests, diseases, and troubleshootingPrevention, diagnosis, environmental disorders, common damage, and first-response checks
Check young leaves for flea beetle holes, aphids and caterpillars. Use row covers early, inspect regularly, and remove badly diseased plants. Crop rotation, drainage and steady watering help limit root disease and stress. A flowering stem means the leafy harvest is ending; use the leaves promptly.
Frequently asked questionsDecision-focused answers that supplement the detailed guides above
Does it form a tight head?
Miike Giant makes a broad, substantial mustard leaf with reddish veins and a lively blend of sweetness and heat.

When should I harvest?
Pick young outer leaves for salads, then larger leaves for cooking around 40-50 days from sowing. Leave the center growing or cut the full plant before bolting. Refrigerate promptly. Save seed from isolated healthy plants; collect and dry ripe pods before threshing.

Why is it flowering early?
Maintain even moisture and remove weeds while small. Rotate brassica beds and use insect netting before flea beetles or caterpillars arrive. Grow for a cool harvest; heat and drought promote bitter leaves and premature flowering.
History and provenanceBotanical identity, cultivar history, regional or cultural context, uncertainty, and source records

Scientific name: Brassica juncea

Miike Giant is an open-pollinated Japanese mustard with loosely headed growth and ruby-veined foliage. Leaf color and pungency vary with the season and growing conditions.

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