All about growing Spring Onions from seed

Growing Guide

Spring onions are quick and easy to grow and are a great ingredient for salads and stir fries. They don't need a lot of space or much soil, so they’re perfect for growing in smaller spaces or a container. With varieties that can be grown all through the winter months, they have a long cropping season, too.

Sow seeds outdoors from March to August at 3 weekly intervals. For a winter and early spring crop sow seeds indoors in September or October and over winter. Whether sowing Spring Onion seed indoors or outdoors, sow liberally 1cm deep in drills 15cm apart. As the seeds are fine, water the drill prior to sowing seeds to prevent them from washing away. If required during dry spells, water as needed.

No thinning is required. However if plants are densely packed, thinnings can be a great addition to salads and stir fries before your main harvest.

  • Key Information

    Height: to 30cm

    Spread: to 5cm

    Hardy annual

    Full sun

    Germination: 7 - 14 days

    Harvest: From 9 weeks

  • Sowing & Growing Schedule

    Sow Indoors: September to October

    Sow Outdoors: March to August

    Plant Out: n/a

    Harvest: All year round

  • Varieties we recommend

    Eiffel

    Slender Star

    Winter White Lisbon

    Lilia (can also be grown as main crop)

Top Tip

Sow Spring Onion in succession for a continuous crop throughout the year. Many varieties, including those recommended and sold by Collie Flowers are good for overwintering, making a late indoor sowing in September or October for further harvest over the winter and early spring months. Spring onions will grow in most good fertile soil provided it is well drained.

Harvesting can usually start 9 weeks after sowing. Use a small fork or trowel to gently lift the plant out of the ground rather than pull and risk snapping it.