
How to grow Swede (Ruby)
Brassica napus var. napobrassica
🥕 Vegetable
🌱 Grown each year
Purple-skinned, sweet, golden-fleshed roots for mash and stews through winter. Very hardy.
At a glance: Sow late April to mid June, harvest from early October.
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 Swede (Ruby): what it needs
- Light
- Full sun · 6+ hours a day
- Watering
- Water regularly in dry weather
- Soil
- Fertile, well-drained soil
- Spacing
- 25 cm
- In pots
- Best in the ground
- Feeding
- A general feed before sowing or planting
- Harvest
- About 70 days from sowing
- Hardiness
- USDA zones 3–9
- Difficulty
- Easy
Step by step
- Late April – mid June · 2 weeks after the last spring frost
Sow Seeds Outdoors
Sow thinly in drills where they are to grow.
- 7–14 days after “Sow Seeds Outdoors” · Early May – mid May
Check Germination
Seedlings should appear in 7–14 days. If sown outdoors, thin to 25 cm apart when big enough to handle.
- 21–35 days after “Check Germination” · Late May – early June
Weed and Water
Hoe off weeds between rows and water in dry spells — even moisture gives better crops.
- Early October – mid February · 2 weeks before the first autumn frost
Start Harvesting
Lift from autumn as needed; they stand in the ground through winter.
- 90–120 days after “Start Harvesting” · Early January – early February
Finish and Clear
Clear the remains to the compost heap once cropping ends.




