Swede is a quintessentially British winter vegetable — sweet, earthy, and frost-hardy enough to stay in the ground until you need it. Sow at the right time in late spring and you'll be lifting tender roots from October right through to February.
Ready to start growing? Read our full How to Grow Swede UK →
Founder & Head Grower, SoilCommander · RHS Level 2 · 12+ years growing in Yorkshire
I've been growing vegetables on my Yorkshire allotment and raised beds since 2012. Everything I write is based on what I've actually grown, failed at, and eventually got right in a real UK climate.
Watch our guide to planting swede in the UK — covering the key sowing window, thinning tips, and how to get a sweet, frost-kissed harvest from October through winter.
🌱 Did you know? In Scotland, swede is called a ‘neep’ and is traditionally served alongside haggis on Burns Night every January!
Swede Sowing & Harvest Calendar
| Task | Timing | Notes |
|---|---|---|
| Sow outdoors | Late May – mid June | Direct sow only; 1.5 cm deep in rows 38 cm apart |
| Germination | 7–14 days | Faster in warm soil; thin promptly |
| Thin seedlings | When 5–7 cm tall | Thin to 23–25 cm apart in the row |
| Roots begin to swell | August – September | Keep weed-free and watered during dry spells |
| Harvest | October – February | Frost improves sweetness; leave in ground until needed |
| Lift and store | November – December | Store in boxes of sand in a cool, frost-free shed |
Sowing Swede
Swede is always direct sown — it dislikes root disturbance and transplants poorly. Sow from late May to mid June, which is the critical window: sow too early and plants run to seed; sow too late and roots won't have time to develop fully before winter. This matches RHS guidance, which warns that cold-soil sowings bolt while late sowings never bulk up. Sow seeds 1.5 cm deep in rows 38 cm apart. Thin seedlings in stages to a final spacing of 23–25 cm within the row once they reach 5–7 cm tall. Thinnings can be composted — they are too small to eat.
Swede prefers a firm, fertile, slightly alkaline soil (pH 6.5–7.0). Lime acid soils before sowing to reduce clubroot risk. Avoid freshly manured ground, which causes forked, hairy roots.
Regional Timing Guide
🏭 South England
Sow from late May. Avoid sowing before mid May — warm springs can trigger bolting. Harvest from October. Roots often survive in the ground through mild winters.
🏭 Midlands & Wales
Sow from late May – early June. Harvest from October–November. Lift and store before the hardest frosts if ground freezes solid.
🏭 North England
Sow from late May – mid June. Swede is well-suited to northern climates — cooler summers reduce bolting risk. Harvest from October. A traditional northern staple crop.
🏭 Scotland
Sow from mid May – early June. Swede thrives in Scottish conditions — known as "neeps" and a national culinary institution. Harvest from September–October. Very cold-hardy.
Best Swede Varieties for the UK
Marian
The most widely grown UK variety — excellent clubroot and mildew resistance. Purple-topped roots with sweet, yellow flesh. Reliable across all regions and soil types.
Invitation
An improved F1 variety with outstanding clubroot resistance. Smooth, uniform roots with excellent flavour. The best choice for gardens with a history of brassica disease.
Ruby
A heritage variety with deep purple skin and rich, sweet flavour. Less disease-resistant than modern F1 types but prized for its traditional taste. Good for showing and kitchen use.
Top 3 Mistakes to Avoid
- Sowing too early: Sowing swede before late May in warm southern gardens risks the plants bolting (running to seed) before the roots develop. The long days and warmth of early spring trigger premature flowering. Wait until late May at the earliest.
- Failing to thin: Overcrowded swede produces small, misshapen roots. Thin promptly and decisively to 23–25 cm spacing. It feels wasteful but is essential — crowded plants compete for nutrients and never develop properly.
- Ignoring clubroot: Swede is a brassica and highly susceptible to clubroot. Lime the soil to raise pH above 7, maintain a strict crop rotation (no brassicas in the same bed for at least 4 years), and choose resistant varieties like Marian or Invitation if clubroot has been a problem.
Companion Planting for Swede
Good companions: Nasturtiums act as a trap crop for aphids and cabbage white butterflies, drawing them away from swede. Celery planted nearby is said to deter Brassica white butterfly. Onions and garlic help mask the scent of brassicas from pests.
Avoid planting near: Other brassicas in the same bed (increases clubroot and pest pressure). Strawberries and fennel are also poor neighbours for swede.
Main Pest Risk: Cabbage Root Fly & Flea Beetle
Cabbage root fly lays eggs at the base of brassica stems; larvae tunnel into roots causing wilting and death. Use brassica collars around each plant at transplanting, or cover with fine insect mesh from sowing. Crop rotation is the best long-term defence.
Flea beetle peppers seedling leaves with tiny holes in warm, dry spells. Cover seedlings with fine mesh immediately after sowing. Established plants tolerate light damage well.
Clubroot causes swollen, distorted roots and stunted growth. There is no cure — remove and destroy affected plants, lime the soil, and rotate crops. Choose resistant varieties for affected plots.
Frequently Asked Questions
When should I sow swede in the UK?
Sow swede outdoors from late May to mid June — this is the critical window. Sowing earlier risks bolting in warm conditions; sowing later means roots won't have enough time to develop fully before winter. In Scotland and northern England, sowing from mid May is fine as cooler summers reduce bolting risk.
Can I transplant swede seedlings?
No — swede dislikes root disturbance and transplants very poorly. Always direct sow where the plants are to grow. Thin seedlings in stages rather than transplanting thinnings.
How far apart should I space swede plants?
Thin swede seedlings to 23–25 cm apart within rows spaced 38 cm apart. Closer spacing produces smaller roots; wider spacing wastes ground. Thin in stages — first to 7 cm, then to final spacing — once seedlings are 5–7 cm tall.
When is swede ready to harvest?
Swede is ready to harvest from October onwards, when roots are roughly tennis-ball sized or larger. Frost actually improves the flavour by converting starches to sugars — so don't rush to lift them. Swede is very hardy and can be left in the ground through winter, lifted as needed. In areas with very hard frosts, lift and store in boxes of slightly damp sand in a cool, frost-free shed.
What is the difference between swede and turnip?
Swede (Brassica napus) and turnip (Brassica rapa) are closely related but distinct crops. Swede has yellow flesh, a sweeter flavour, and takes longer to mature (20–26 weeks). Turnips have white flesh, a sharper flavour, and mature much faster (6–10 weeks). Swede is larger and hardier, making it better suited to winter storage. In Scotland, swede is called "neeps" and turnip is called "tumshie" — a source of much confusion south of the border!
🌿 Did You Know?
Swede is believed to have originated in Bohemia (modern Czech Republic) in the 17th century as a natural cross between a turnip and a wild cabbage. It was introduced to Britain in the late 18th century and quickly became a staple of Scottish and northern English cooking. In Scotland, "neeps and tatties" — mashed swede and potato — is the traditional accompaniment to haggis on Burns Night every 25th January.
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