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Best Onion Sets for Winter Planting in the UK
Introduction
Onions are one of the most rewarding and easy crops to grow in the UK, providing a staple ingredient for countless dishes. While many gardeners plant onions in spring, growing onion sets in winter has become increasingly popular. Winter onion sets are specially bred to survive the cold, giving you an earlier harvest the following summer and making excellent use of garden beds during the quiet winter months.
But not every onion variety is suited to winter planting. Choosing the right sets is essential for strong, healthy crops. In this guide, we’ll explore the best onion sets for winter planting in the UK, along with planting tips, care advice, and storage guidance.
Why Plant Onion Sets in Winter?
- Earlier harvest: Winter onions are ready weeks before spring-planted ones.
- Low maintenance: Minimal attention needed over winter.
- Efficient garden use: Makes the most of otherwise empty beds.
- Hardy crops: Winter onion sets are bred to cope with frost and cold weather.
- Beginner-friendly: Simple to grow and forgiving for new gardeners.
Best Onion Sets for Winter Planting in the UK
1. Shakespeare
- Type: Yellow onion
- Why it’s great: Shakespeare is one of the most reliable and disease-resistant overwintering onions. It establishes quickly and produces medium to large bulbs with classic onion flavour.
- Harvest: June
- Best for: Beginners who want fuss-free onions.
2. Radar
- Type: Yellow onion
- Why it’s great: Radar is famous for its exceptional hardiness, coping with even the harshest UK winters. It produces firm, round bulbs with good flavour.
- Harvest: June
- Best for: Gardeners in colder northern regions.
3. Senshyu Yellow
- Type: Japanese overwintering onion
- Why it’s great: Bred specifically for overwintering, Senshyu Yellow produces medium-sized bulbs with excellent flavour. It’s well-suited to damp, cool UK winters.
- Harvest: June–July
- Best for: Coastal and mild areas.
4. Electric
- Type: Red onion
- Why it’s great: One of the best overwintering red onions. Electric produces attractive red bulbs with a sweet, mild flavour, perfect for salads and cooking.
- Harvest: June–July
- Best for: Adding colour and variety to your onion crop.
5. Troy
- Type: Yellow onion
- Why it’s great: Troy is a popular overwintering onion set that produces uniform, medium-sized bulbs. It has strong disease resistance and good storage potential.
- Harvest: June–July
- Best for: Reliable harvests and longer storage.
6. Hyred
- Type: Red onion (hybrid)
- Why it’s great: A high-yielding hybrid overwintering variety. Hyred produces deep red bulbs with excellent flavour and strong disease resistance.
- Harvest: June–July
- Best for: Gardeners who want both colour and reliability.
7. Swift
- Type: Yellow onion
- Why it’s great: Known for its speed, Swift matures earlier than most overwintering onions, giving you an extra-early crop.
- Harvest: Late May to June
- Best for: Gardeners eager for the first onions of summer.
8. Autumn Champion
- Type: Yellow onion
- Why it’s great: A dependable overwintering onion that establishes quickly and produces large, uniform bulbs with strong flavour.
- Harvest: June
- Best for: Gardeners who want reliable, classic onions.
9. Red Arrow
- Type: Red onion
- Why it’s great: Produces rich, deep red bulbs with mild flavour. It’s a good choice for salads and adds variety alongside yellow onions.
- Harvest: June–July
- Best for: Gardeners who love red onions.
10. White Lisbon (Spring Onion)
- Type: Salad onion
- Why it’s great: While not a bulb onion, White Lisbon can be sown in autumn or winter for an early crop of fresh spring onions. Perfect for salads and stir-fries.
- Harvest: March–May
- Best for: Early fresh greens before bulb onions are ready.
When to Plant Winter Onion Sets in the UK
- Best planting time: November–December.
- In mild southern regions, planting can extend into January.
- In colder northern regions, aim for November so sets establish before hard frosts.
How to Plant Winter Onion Sets
- Prepare the soil: Choose a sunny, well-drained bed and dig in compost.
- Spacing: Plant sets 10cm apart in rows 25–30cm apart.
- Depth: Plant 2–3cm deep with tips just under the surface.
- Firm: Press soil gently to secure sets.
- Protect: Cover with fleece or netting to prevent birds from pulling sets out.
Caring for Winter Onions
- Over winter: Minimal care needed. Check for frost heave and re-firm sets if necessary.
- In spring: Weed regularly and feed with a nitrogen-rich fertiliser.
- In early summer: Water in dry spells and switch to a potassium-rich feed to encourage bulb swelling.
Harvesting and Storing Winter Onions
- Harvest: June–July when leaves yellow and flop over.
- Cure: Dry in a well-ventilated space for 2–3 weeks.
- Storage: Keep in mesh bags, nets, or braids in a cool, dry place.
- Shelf life: 3–5 months (shorter than spring-planted onions).
Common Mistakes When Planting Winter Onion Sets
- Planting too shallow → Birds pull them out.
- Planting too late → Weak root establishment.
- Overwatering in winter → Bulbs rot in waterlogged soil.
- Overcrowding → Poor airflow and small bulbs.
- Not rotating crops → Increases risk of onion diseases like white rot.
Conclusion
Planting winter onion sets is one of the simplest ways to enjoy an early summer harvest in the UK. Varieties like Shakespeare, Radar, and Senshyu Yellow are reliable choices, while colourful options like Electric and Hyred add variety to your crops. By planting in November–December, preparing your soil well, and protecting young sets from frost and birds, you’ll have a strong, healthy crop ready to lift by June.
Winter onion planting is low-maintenance, beginner-friendly, and an excellent way to keep your garden productive all year round.
Top 10 Questions About Winter Onion Sets
1. What are the best onion sets for winter planting in the UK?
Shakespeare, Radar, Senshyu Yellow, and Electric are among the best.
2. When should I plant winter onion sets?
November–December, or January in mild areas.
3. Do winter onions survive frost?
Yes, overwintering varieties are bred to cope with cold UK winters.
4. How deep should I plant onion sets?
2–3cm deep, with tips just below the soil.
5. How far apart should onion sets be spaced?
10cm between sets, 25–30cm between rows.
6. When are winter onions harvested?
June–July the following year.
7. How long do winter onions store for?
Around 3–5 months.
8. Can I plant winter onion sets in containers?
Yes, use pots at least 25cm deep with free-draining compost.
9. Do birds pull up onion sets?
Yes, cover with fleece or netting until they root.
10. Can I plant supermarket onions in winter?
No, they are not bred for overwintering and may rot or bolt.
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