Kohlrabi: Spacing, Yield & Planting Dates
Plant count & yield calculator
Pre-filled for this crop — adjust bed size or pick a different vegetable.
Enter bed size to count plants.
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Seed starting dates
Pre-filled last frost — change the date to rebuild the full crop schedule. For Kohlrabi with this frost date : start indoors ~Mar 18, transplant ~Apr 8, direct sow ~Mar 25 .
Pick a last frost date for the schedule.
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Show the math & assumptions
Assumptions and formulas will appear here once you calculate.
About kohlrabi
Kohlrabi is an underrated brassica that forms a crisp, mild-flavored stem bulb above ground, ready to eat raw or cooked in just 55 days.
Spacing & yield
Kohlrabi wants 6×12 inches and about 0.5 lb per plant at ~55 days to maturity.
Growing tips
- Harvest when bulbs are 2-3 inches in diameter for best texture — larger ones turn woody.
- Succession-sow in spring and again in late summer for two crops.
- Thin seedlings to 6 inches early; crowded kohlrabi produces stringy, undersized bulbs.
- Peel the outer skin before eating raw in slaws or cooked in stir-fries.
Common mistakes
- Letting bulbs grow past tennis-ball size, resulting in tough, fibrous flesh.
- Forgetting to thin direct-sown seedlings to proper 6-inch spacing.
- Growing in summer heat, which makes bulbs crack and turn bitter.
Harvest & storage
Cut the bulb from the root when 2-3 inches across, about 55 days from sowing.
Remove leaves and refrigerate bulbs for 2-3 weeks; they keep well in root-cellar conditions.
Companion planting
Good neighbors for kohlrabi: beets, celery, cucumbers, onions. Avoid planting beside: tomatoes, peppers, strawberries.
Planting calendar
Start indoors about 4 weeks before last frost, then transplant 1 weeks before frost. Direct sow is also an option around 3 weeks before frost. Use the seed-starting calculator above with your real county frost date — the April 15 default is only a worked example (zone 6 style).
Estimates only — consult your local extension office for advice specific to your land and animals.
Frequently asked questions
- How far apart is kohlrabi planted?
- Space 6 inches in-row with 12 inches between rows; this quick-growing crop fits well in succession plantings.
- How much does one kohlrabi yield?
- Each plant produces a single bulb weighing about 0.5 lb at ideal harvest size.
- How fast does kohlrabi grow?
- One of the fastest brassicas at roughly 55 days from seed to harvest — faster than broccoli or cabbage.