Kossak
(F1) Kohlrabi Seed
Product ID: 237
Giant kohlrabi for storage.
Harvest when round and about 8" diameter, before it begins to elongate. At this size, the roots will store well and the flesh will be sweet, tender, and delicious. Kossak will keep in cold storage for up to 4 months. Also available in organic seed. Avg. 5,800 seeds/oz. Packet: 100 seeds.
https://www.johnnyseeds.com/vegetables/kohlrabi/storage-kohlrabi/kossak-f1-kohlrabi-seed-237.11.html
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SCIENTIFIC NAME:Brassica oleracea var. gongylodes
CULTURE: Kohlrabi prefers mild or cool weather. It is grown throughout the season in the North, and during fall and winter in the South. Sow 15 seeds/ft., 1/4- 1/2" deep, in rows 12-18" apart. Thin fresh-market varieties to 4" between plants. Thin storage varieties to 10" between plants. For earliest crops start in flats or plug trays and transplant. Fertile, well-irrigated soil promotes rapid growth, which makes for a sweeter flavored crop. Harvest when roots are about 2-3" diameter; 8" diameter for storage varieties.
DISEASES: Adhere strictly to a preventive program including: (1) long crop rotations with non-brassica crops, (2) clean starting mixes and outdoor seedbeds, and (3) strict sanitation practices. Johnny's Selected Seeds only sells seed lots of kohlrabi that have tested negative for black rot (Xanthomonas campestris pv. campestris) and black leg (Phoma lingam).
DAYS TO MATURITY: From direct seeding; for days to maturity from transplanting, subtract about 14 days.
AVG. DIRECT SEEDING RATE: 250 seeds/16', 1,000 seeds/66', 436M/acre at 15 seeds/ft with rows 18" apart.
TRANSPLANTS: Avg. 4,500 plants/oz., 800 plants/1,000 seeds.
SIZED SEEDS: Standard except where noted.
SEED SPECS: SEEDS/OZ.: Avg. 6,200.
PACKET: 100 seeds, sows 8'.
CULTURE: Kohlrabi prefers mild or cool weather. It is grown throughout the season in the North, and during fall and winter in the South. Sow 15 seeds/ft., 1/4- 1/2" deep, in rows 12-18" apart. Thin fresh-market varieties to 4" between plants. Thin storage varieties to 10" between plants. For earliest crops start in flats or plug trays and transplant. Fertile, well-irrigated soil promotes rapid growth, which makes for a sweeter flavored crop. Harvest when roots are about 2-3" diameter; 8" diameter for storage varieties.
DISEASES: Adhere strictly to a preventive program including: (1) long crop rotations with non-brassica crops, (2) clean starting mixes and outdoor seedbeds, and (3) strict sanitation practices. Johnny's Selected Seeds only sells seed lots of kohlrabi that have tested negative for black rot (Xanthomonas campestris pv. campestris) and black leg (Phoma lingam).
DAYS TO MATURITY: From direct seeding; for days to maturity from transplanting, subtract about 14 days.
AVG. DIRECT SEEDING RATE: 250 seeds/16', 1,000 seeds/66', 436M/acre at 15 seeds/ft with rows 18" apart.
TRANSPLANTS: Avg. 4,500 plants/oz., 800 plants/1,000 seeds.
SIZED SEEDS: Standard except where noted.
SEED SPECS: SEEDS/OZ.: Avg. 6,200.
PACKET: 100 seeds, sows 8'.
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Quick Facts
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Latin Name
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Brassica oleracea var. gongylodes
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Days To Maturity
Average number of days from seeding date to harvest, within a specific crop group. If a transplanted crop: average number of days from transplant date. Not sure if crop is direct-seeded or transplanted? Check the Growing Information box for details. If crop can be both direct-seeded or transplanted, days to maturity refers to direct seeding. Days to maturity for all flowers and herbs is calculated from seeding date. -
80 Days
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Life Cycle
Plants can be Annuals (single growing season), Perennials (grow year after year), Tender Perennials (grow year after year in warmer climates; and in some cases when given special protection in colder climates), or Biennials (require two years to mature). -
Annual
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Hybrid Status
Hybrid: The offspring of a cross between two or more distinct parent lines, usually of same species, and selected for improved traits.
Open-pollinated: A non-hybrid variety that can reproduce itself in kind, demonstrating relatively stable traits from one generation to the next. -
Hybrid (F1)