We're offering you a Onion (Autumn & Spring) Snowball for £3.99, saving you up to 43% off Thompson and Morgan's's price of £6.99 (correct as of 03.02.2026).

Onion 'Snowball' - Mild Flavour

Discover Onion 'Snowball' – Your All-Season Kitchen Staple

Allium cepa 'Snowball' is a standout white onion variety prized for its mild flavour and robust growth. This hardy bulb is ideal for UK gardens, offering dependable yields whether you plant in autumn or spring.

• Mild Flavour: Enjoy crisp, gentle onions that enhance salads, salsas, and cooked dishes without overpowering other ingredients.
• Outstanding Storage: Harvested bulbs keep well for months, letting you enjoy homegrown onions through the seasons.
• Bolting Resistance: Specially bred to resist premature flowering, ensuring more usable bulbs per crop.

Growing Guide

• Planting Time: Sow sets outdoors from September to November or in early spring (February–April).
• Site: Choose a sunny, well-drained spot with fertile soil; avoid waterlogged areas.
• Soil: Prefers neutral to slightly alkaline soils (pH 6.5–7.5). Work in compost before planting for best results.
• Cultivation: Space sets about 10cm apart in rows 25cm apart. Keep weed-free and water during dry spells.
• Mature Size: Typically forms round bulbs up to 7cm across.

Seasonal Care Tips

• Harvest: Lift bulbs in summer when foliage yellows and dries. Allow to cure before storing.
• Pest & Disease: Rotate crops yearly to reduce risk of onion fly and white rot.
• No Pruning Needed: Simply remove flower stems if any appear.

Companion Planting & Design Ideas

• Great with carrots, lettuce, and beetroot—these combinations help deter common pests.
• Add 'Snowball' onions to vegetable beds or allotments for continuous supply and visual interest.

FAQs

• When is the best time to plant Onion 'Snowball'?
  You can plant in autumn (September–November) for summer harvests or early spring (February–April) for late summer crops.
• How long do the harvested onions store?
  'Snowball' onions are known for excellent storage—when cured properly, they can last several months in a cool, dry place.
• What soil type is best?
  This variety thrives in well-drained, fertile soils with a neutral to slightly alkaline pH (6.5–7.5).