Onion Sets for Welsh Gardens – Spring & Overwintering Varieties

When to Sow Onion Sets in Wales

In Wales, spring onion sets such as Sturon, Snowball, and Red Karmen can be planted from March to mid-April, depending on your local microclimate. For overwintering onions like Troy F1 and Senshyu Yellow, aim for mid-September to early November.

Wales’ wetter climate and milder winters are generally favourable, but raised beds or free-draining soil help prevent rot in heavy rain.

Best Time to Plant Onion Sets in Wales

• Spring planting: March–April, once the soil is workable and not waterlogged
• Autumn planting: September–early November, allowing time for root establishment

Avoid planting after heavy rain or when frost is forecast. Mulching or fleece is useful protection during colder snaps in upland or inland areas.

How to Grow Onion Sets in Wales

• Choose a sunny, well-drained spot – onions dislike soggy roots
• Push sets into the soil so just the tip shows, spacing 10cm apart
• Use netting or fleece to protect from birds and frost
• Weed regularly and water only in dry spells
• Avoid nitrogen-rich composts or fresh manure – they promote too much leaf growth

Can You Grow Onion Sets in Wales?

Absolutely! Onion sets grow well throughout Wales. The key is choosing the right variety and planting time. For coastal or southern regions, overwintering sets like Troy F1 thrive. In cooler or wetter inland areas, focus on spring planting with Sturon or Snowball.

Tips for Growing Onion Sets in Wales

• Improve clay or wet soils with compost and grit
• Plant overwintering onions early enough for root growth
• Watch for bolting in spring – harvest early if needed
• Rotate your onion bed yearly to avoid disease build-up
• Lift onions once tops flop over and necks begin to dry

Best Onion Set Varieties for Wales

• Troy F1 – Fast-growing overwintering set, great for Welsh autumns
• Senshyu Yellow – Milder flavour, excellent cold tolerance
• Red Karmen – Striking colour and ideal for salads
• Sturon – Reliable spring set with good storage life
• Red Winter – Hardy overwintering red onion
• Snowball – White spring variety, ideal for early harvests

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