PlantSowGrow
How to grow Kohlrabi (Azur Star)
Brassica oleracea Gongylodes Group
🥕 Vegetable
🌱 Grown each year
Purple, turnip-like swollen stems with a crisp, sweet, mild cabbage flavour — eat raw or cooked. Fast growing.
At a glance: Sow early April to mid July, harvest from late May.
When to sow, plant and harvest
JanFebMarAprMayJunJulAugSepOctNovDec
Sow outdoors
Harvest
Timed for a typical UK garden (last frost mid-April). The app uses your own town's frost dates.
Growing Kohlrabi (Azur Star): what it needs
- Light
- Full sun · 6+ hours a day
- Watering
- Water regularly in dry weather
- Soil
- Fertile, well-drained soil
- Spacing
- 20 cm
- In pots
- Grows well in containers
- Feeding
- A general feed before sowing or planting
- Harvest
- About 55 days from sowing
- Hardiness
- USDA zones 3–9
- Difficulty
- Easy
Step by step
- Early April – mid July · 2 weeks before the last spring frost
Sow Seeds Outdoors
Sow thinly in drills where they are to grow.
- 5–10 days after “Sow Seeds Indoors” · Early April – mid April
Check Germination
Seedlings should appear in 5–10 days. If sown outdoors, thin to 20 cm apart when big enough to handle.
- 45–66 days after “Check Germination” · Late May – mid June
Start Harvesting
Harvest at tennis-ball size, before they get woody.
- 14–28 days after “Start Harvesting” · Early June – mid June
Sow Another Batch (optional)
Sow again every 3–4 weeks.
- 25–55 days after “Sow Another Batch” · Late June – late July
Finish and Clear
Clear the remains to the compost heap once cropping ends.
