Gunma Green Cabbage


Gunma Green Cabbage

(110 days) F-1 hybrid. Named for a prefecture on Honshu Island in Japan known for its cabbage production. Our choice for a superior flat-topped green cabbage ideal for cooks and gourmets, good for kraut and kimchi. Its good moisture content makes sufficient brine so that you don’t need to add more to the kraut. Its large heads (avg. 5–7 lb but can get up to 11–13 lb) grow nearly 1' across, yet remain almost coreless. Although ready on Aug. 2 from a May 21 transplanting, these cabbages sat in the field for two months without splitting. Sweet tender wrapper leaves suitable for cabbage wraps and rolls. Outer leaves can’t hold up once nighttime temperatures plummet to the 20s, so not for storage, but “great for early kraut,” says Betsy Bott of Bog Iron Farm & Forge in Blue Hill, Maine. Resists FY, TB. Tested negative for BR and BL.

3392 Gunma
Item Discounted
A: 0.2g for $3.20  
B: 0.4g for $5.00  
C: 1g for $8.40  
D: 4g for $28.00  
E: 28g for $170.00   ($161.50)
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Additional Information


Brassica oleracea (capitata group)

~6,000–7,000 seeds/oz; 210–250 seeds/g. Blue-purple foods such as red cabbage and purple cauliflower contain anthocyanins and phenolics, which benefit the urinary tract, memory and immune system.

Culture: Exposure to hoarfrost is good for cabbages. They double their sugar content after one month of cold.

Red cabbage seedlings are often used for microgreens.

Minimum germination soil temperature 40°, optimal range 55–95°.


Days to maturity are from direct seeding. Subtract 20 days from date of transplanting.

Note: We cannot ship packets greater than ½ oz. (14 grams) of any Brassica into the Willamette Valley. The State of Oregon prohibits shipping any commercial quantity of untreated Brassica, Raphanus or Sinapis because of a quarantine to control Blackleg.

Culture: Hardy. Require warm temperatures to germinate (68-86° ideal) but need 60s during seedling stage for optimal growth; higher temperatures make seedlings leggy. Heavy feeders; for best growth, need regular moisture and 2–3' spacing. Have done well for us succeeding onions and garlic in beds. Cauliflower and broccoli are damaged by hard frosts, especially in spring.

Young broccoli sproutlings make good microgreens.


  • BR: Black Rot
  • BS: Bacterial Speck
  • DM: Downy Mildew
  • FY: Fusarium Yellows
  • TB: Tipburn
  • WR: White Rust

Pests & diseases: Major pests: Cabbage Looper, Diamondback Moth, Imported Cabbageworm
Cultural controls: control cabbage-family weeds near crop fields, till under crop debris of early-season brassicas after harvest.
Materials: Spinosad, Bt.

Pest: Flea Beetle
Cultural controls: floating row covers, mulch with straw, time plantings for fall harvested crops only, crop rotation, perimeter trap cropping.
Materials: Spinosad, PyGanic.

Pest: Cabbage Root Maggot
Cultural controls: time planting to avoid first hatching, use row covers, control weeds.

Major diseases: Black Rot, Alternaria Leaf Spot, Blackleg, Club Root, Downy Milldew, White Mold
Cultural controls: avoid transplanting plants with yellow leaves or v-shaped lesions, crop rotation, destroy crop debris after harvest, avoid overhead irrigation, control weeds, allow for good air movement.
Materials: Actinovate, copper compounds may help for some of these diseases.