Onion Sets for Scottish Gardens – Best Varieties for Cold Climates

When to Sow Onion Sets in Scotland

In Scotland, spring-planted onion sets like Sturon and Red Karmen should go in the ground from late March through mid-April, once the soil begins to warm. For overwintering onions such as Troy F1 or Senshyu Yellow, plant in September to early October to allow roots to establish before harsh frosts.

In colder regions or upland areas, wait until the risk of heavy frost has passed or provide fleece protection for overwintering types.

Best Time to Plant Onion Sets in Scotland

• Spring planting: Late March to April when soil is workable
• Overwintering planting: Mid-September to early October

Scotland's short growing season means choosing hardy, fast-maturing varieties is key. Raised beds and wind protection can help maximise results.

How to Grow Onion Sets in Scotland

• Use raised beds or add grit to improve drainage in heavy soils
• Plant onion sets 10cm apart with tips just showing
• Protect with fleece or mesh in exposed areas
• Water during dry spells, especially in early stages
• Use netting to prevent birds from pulling sets out

Can You Grow Onion Sets in Scotland?

Yes – onions grow well in Scotland when you choose the right varieties and adapt to local conditions. Use Troy F1 or Senshyu for overwintering and Sturon or Snowball for spring. Ensure the soil is well-drained and avoid sowing during prolonged wet or freezing conditions.

Tips for Growing Onion Sets in Scotland

• Choose cold-hardy and quick-maturing varieties
• Avoid planting in waterlogged soil – raised beds are ideal
• Cover overwintering onions with fleece in harsh winters
• Harvest promptly once tops flop and bulbs mature
• Rotate annually to prevent onion white rot and downy mildew

Best Onion Set Varieties for Scotland

• Troy F1 – Very hardy overwintering variety, perfect for Scottish winters
• Senshyu Yellow – Autumn variety with strong cold resistance
• Sturon – Classic spring set that stores well and matures reliably
• Red Karmen – Mild flavour and deep red skin, great for salads
• Snowball – A white spring onion, great for fast harvests
• Red Winter – Overwintering red variety, well suited to Scottish climates

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