We're offering you a Organic Onion (Spring) Setton F1 for £3.99, saving you up to 56% off Thompson and Morgan's's price of £8.99 (correct as of 03.02.2026).

Grow Superior Organic Spring Onions with 'Setton F1'

Onion 'Setton F1' is a modern, high-performing spring onion variety bred for gardeners who demand quality and reliability. As a hybrid selection, it offers uniform, globe-shaped bulbs that look as good as they taste—perfect for both novice and experienced growers.

• Bountiful Harvests: Expect higher yields than standard onion sets, giving you more home-grown produce from every square metre.
• Storage Power: These onions store exceptionally well, letting you enjoy their flavour long after the growing season ends.
• Award-Winning Performance: Recognised with the RHS Award of Garden Merit, 'Setton F1' is trusted by gardening experts for reliability and taste.

Growing Guide: Simple Steps for Success

• Planting Time: Plant onion sets from February to April for the best results.
• Soil & Position: Choose a sunny, open site with well-drained, fertile soil (pH 6.0–7.0). Enrich soil with organic matter before planting.
• Spacing: Space sets about 10cm apart in rows 25cm apart for optimal growth.
• Watering: Water regularly during dry spells but avoid waterlogging.
• Pest & Disease Tips: Rotate crops yearly to prevent onion fly and white rot. Remove weeds promptly to reduce competition.

Seasonal Care & Harvesting

• Maturity: Harvest from July onwards when foliage starts to yellow and topple over.
• Curing: Dry bulbs thoroughly in a well-ventilated area before storing in a cool, dry place.

Companion Planting & Design Ideas

• Companions: Plant alongside carrots or beets to help deter pests and maximise bed productivity.
• Garden Design: Use in raised beds or traditional rows—these onions' tidy growth habit suits any plot.

FAQs

• When should I plant Onion 'Setton F1'?
  You should plant between February and April once the soil is workable and frost risk has passed.
• How long until harvest?
  'Setton F1' typically matures in about 20–24 weeks, with harvest from July onwards.
• What care do these onions require?
  Keen on sun and well-drained soil, they need regular watering during dry periods and benefit from crop rotation each year.