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.