Type
giant, hybrid
Kohlrabi variety
Kossak Kohlrabi
Kossak is bred to grow much larger than standard kohlrabi while staying relatively tender. It is useful when gardeners want fewer but larger bulbs.
Days to maturity
80-90
Best for
large bulbs, fall harvests
About Kossak
Kossak is a giant storage kohlrabi hybrid that can grow much larger than table types while staying sweet and tender. Bulbs are pale green and suited to gardeners who want size without the coarse texture many oversized kohlrabi develop.
Growing Kossak Kohlrabi
Give Kossak more spacing and a longer season than early kohlrabi, and think of it as a fall crop in many regions. Harvest once bulbs are large but before hard freeze, and protect from cabbage worms while plants are building leaf area.
Full growing guide
For planting dates, care, and harvest that apply to all kohlrabi, see the complete guide.
How to grow KohlrabiOther kohlrabi varieties
Variety characteristics are general guidance for US home gardens; performance varies by climate, soil, and season. Seed and plant availability differs by supplier. Page updated Aug 4, 2026.