KOSAK Hybrid

Family: Brassicaceae Vegetable

Sweetly crisp and delicately peppery, KOSAK Hybrid kohlrabi forms smooth, globe-topped bulbs with a clean, tender snap and a fresh, garden-bright flavor.

The flesh stays pleasantly fine-textured at maturity, making it ideal for standout raw plates, quick pickling, and vibrant slaws where its mild bite shines. Grow KOSAK Hybrid for reliable, uniform development in about 55 days—an elegant, edible garden centerpiece from seed to harvest.

Light: Full SunMaturity: 55 DaysHabit: Upright

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Mar 28th
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 18th
Harvest Begins	Jun 12th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	55
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	42
Min Soil Temp (°F)	40
Min Night Temp (°F)	30
Harden Off (days)	6

Culinary Notes

Chef's Note

KOSAK Hybrid stays pleasantly fine-textured even as it matures, so you get that clean kohlrabi snap in every forkful—raw, pickled, or lightly seared. The mild peppery bite plays especially well with lemony acidity and creamy dairy, without demanding a heavy sauce.

Best Uses

raw shavings under a bright vinaigrette
quick pickles for quick vinegar tang and crunch
vibrant slaws that don’t go watery
seared coins where the outside caramelizes and the center stays snappy

Flavor Profile

sweetly crisp bite delicately peppery edge fine, tender snap

Kitchen Pairings

lemon black pepper mustard butter Greek yogurt smoked salmon

Frequently Asked Questions

What pest or disease is most likely on Brassica oleracea var. gongylodes (KOSAK Hybrid) and how do I manage it?

Watch for cabbageworm and cabbage looper larvae on kohlrabi; small holes on leaves and frass are common signs. Hand-pick larvae early and spray with Bacillus thuringiensis (Bt) when you first see feeding, repeating per label directions. If clubroot appears (wilting plants despite moist soil and swollen roots), remove affected plants and avoid replanting brassicas in the same bed for several years.

How often should I water kohlrabi (Brassica oleracea var. gongylodes) during the main bulbing phase?

During the bulbing stage (once stems start thickening), keep soil consistently evenly moist—about 1–1.5 inches of water per week split into 1–2 waterings if it doesn’t rain. Avoid letting the bed dry out completely and then soaking, because kohlrabi is prone to cracking and becoming pithy after irregular moisture.

How can I tell when KOSAK Hybrid kohlrabi is ready to harvest?

Harvest when the swollen stem (the “bulb”) reaches the typical size you want and feels firm—about 55 days from transplanting (per your schedule) with the skin still smooth. Overgrown kohlrabi turns tough and woody, so don’t wait past firmness; use a knife to cut the bulb at the base just above the soil line.