GardenKohlrabi variety
Kossak Kohlrabi
✓ In your garden
Kossak is a giant kohlrabi, ready in about 80 days. You eat the crisp, swollen stem — mild and sweet like a cabbage-turnip, good raw or cooked. This is a giant storage type, bred to grow big — softball-plus — and stay tender rather than woody, so it keeps for weeks into winter.
“A crisp, mild swollen stem — half cabbage, half turnip.”
Growing basics — shared by every kohlrabi
Kossak grows like any other kohlrabi. The full picture — how deep to plant, spacing, feeding, pests, harvest — lives on the Kohlrabi page so it's maintained in one place.
- Sun
- Full Sun
- Spacing (in row)
- 4–6 in
- Row spacing
- 12–24 in
- Planting depth
- 0.25–0.5 in
- Soil pH
- 6–7.5
- Water
- Moderate
What is Kossak good for?
- Raw & slawsPeel and eat it like an apple. Great
- Roasted / sautéedMild and sweet cooked. Great
- Winter storageA giant that stays tender and keeps for weeks. Great
From how it grows — kitchens vary.
What Kossak is known for
Johnny's Selected Seeds describes this as:
- keeps a long time after picking
That is the company selling the seed, describing its own product. True, and worth weighing as such.
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Want the full 10/50/90% odds + nearest stations? Open the frost tool →When to plant Kossak in your zone
Zone 6bGreenhouse or cover on: your start slides ~4 weeks earlier and your harvest stretches ~3 weeks later (shown striped).
Planting seeds straight in the ground only works where the season's long and warm — most gardeners start seeds indoors or buy young plants, or you'd pick your first tomato right as frost hits.
Comfortable — first ripe fruit lands around late Jun, well before your typical frost (~late Oct).
- Start seeds indoors
- mid Feb – early Mar
- Toughen up outside
- late Mar – early Apr
- Move plants outside
- early Apr – early Apr
- Plant seeds outside
- early Apr – early Apr
- Growing
- early Apr – late Jun
- Picking
- late Jun – early Jul
Typical dates for zone 6b — set your zone or ZIP above for yours.
Growing Kossak — the things that trip people up
- A giant storage type — let it size right up; unlike the small types it stays tender, not woody. Harvest before hard frost and it keeps for weeks.
- Brassicas are cool-season — they bolt or turn bitter in summer heat, so grow them in spring and fall. Feed them well and watch for cabbage worms (the little green caterpillars); a floating row cover keeps the moths off.
Kossak kohlrabi at a glance
| Type | Giant |
|---|---|
| Days to ripe | 80 days after you plant it outside |
| Color | Green |
Extra fields from seed-catalog listings and university growing guides. Days to ripe and disease resistance shift with your climate and seed source — double-check with your local extension office before you buy.
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Common questions about Kossak
How long does Kossak take to grow?
About 80 days from transplant. Start seeds indoors and set out young plants for a strong start.
When should I grow Kossak?
In the cool of spring or fall — brassicas bolt and turn bitter in summer heat. Fall crops often taste best, sweetened by a light frost.
Browse more kohlrabi varieties →