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Package of Johnny's Selected Seeds
Package of Johnny's Selected Seeds
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Kossak(F1) Kohlrabi Seed


Product ID: 237

Giant kohlrabi for storage.

Kossak will reach a diameter of up to 8", and the interior will still be sweet, delicious, and tender. For best quality and storage, harvest when round and about 8" diameter, before it begins to elongate. Kossak will keep in cold storage for up to 4 months. Organic seed is also available. Avg. 5,800 seeds/oz. Packet: 100 seeds.

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Quick Facts

Days to Maturity or Bloom:   80

Plant Cycle:   (A)  

Shipping Information & Notes

Growing Information


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 such as 'Kossak' 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.
From direct seeding; subtract about 14 days if transplanting.
We only stock seed lots that have been tested free of black rot in a sample of 30,000 seeds. For seed lots received after August 2015, individual seed lots have been tested free of black leg in a sample of 1,000 seeds.
AVG. DIRECT SEEDING RATE: 250 seeds/16', 1,000 seeds/66', 436M/acre at 15 seeds/ft with rows 18" apart.
Avg. 4,500 plants/oz., 800 plants/1,000 seeds.
Standard except where noted.
SEEDS/OZ.: Avg. 6,200.
100 seeds, sows 8'.

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