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Growing Salad Onions from Sowing to Harvest

August 29th, 2019 | News | 0 Comments

Growing Salad Onions from Sowing to Harvest

They’re fresh, fast and fabulous in salads, stir-fries, quiches and savoury tarts. We’re talking about salad onions, also known as scallions, spring onions or green onions. Whatever you call them, they’re great for fitting in wherever there’s space and will give you a harvest of peppery stems in as little as eight weeks.

Salad onions are also one of those crops that can be sown in late summer to give one of the earliest harvests next spring. So let’s get on and grow some! Read on or watch the video to find out how.

Where to Grow Salad Onions

Like their bulb-forming cousins, salad onions prefer a sunny, open site and fertile, well-drained soil. For best results, grow them in soil that’s been improved with regular additions of well-rotted organic matter such as compost.

A close up of spring onions growing in a container on a windowsillThese tall, thin plants don’t take up much space, so they’re ideal for containers, or be opportunistic and grow them between rows of slower growing vegetables such as parsnips until they need the extra space. Another option is to grow them with carrots, where they may help to reduce problems with carrot fly.

When to Sow Salad Onions

Start sowing under cover from late winter, then continue outside from spring. Sow short rows every three to four weeks to give a steady supply of stems. Your last sowings, made at the very end of summer using a winter hardy variety, will be ready to harvest early next season.

How to Sow Salad Onions

Sow seeds directly where they are to grow or into containers of potting soil to transplant later on.

Direct sow seeds into finely-raked soil. Mark out a drill about half an inch (1cm) deep. Use a string line if you prefer neat, straight rows. Additional rows should be spaced about 4in (10cm) apart. If it’s hot and dry, water along the rows before sowing. This creates a cooler environment around the seeds, helping them to germinate.

Sow the seeds thinly along the rows then pinch the drill closed to cover the seeds. Alternatively, backfill the rows with potting soil. This is useful if your soil isn’t as fine and crumbly as you’d like at sowing time, and also helps rows to stand out clearly from the surrounding soil for the purposes of weeding. Once you’re done, label the rows and water thoroughly.

Sowing into containers helps to make the best use of your available space because you can start seedlings off while the ground is still occupied by a growing crop. By starting plants off under the protection of a greenhouse, tunnel or cold frame you’ll be able to start sowing up to six weeks sooner at the beginning of the growing season.

The easiest method is to use plug trays. Fill your plug trays with a general-purpose potting mix then firm the mix down into the modules with your fingertips. Sow a pinch of four to eight seeds per module then cover them with more potting mix. Water and keep the potting soil moist as the seedlings appear and grow on.

Planting Salad Onions

Transplant the clusters of seedlings as soon as they have filled their modules and you can see roots at the drainage holes. Carefully ease the plugs from the tray then plant them into prepared soil so each cluster is 2-4in (5-10cm) apart within the row, with rows spaced at least 4in (10cm) apart. Water the young plants to settle the soil around the rootball.

Caring for Salad Onions

A bunch of spring onions laid down on a wooden ledge, freshly harvested from an allotmentDirect sown salad onions shouldn’t need much thinning but if there are any overly thick clusters of seedlings, remove some of the excess to leave about half an inch (1cm) between plants.

Remove weeds as they appear to prevent them from overwhelming your plants. Salad onions are shallow-rooting, so water in dry weather to speed growth and minimise the risk of plants bolting, or flowering prematurely.

Salad onions are rarely bothered by pests but birds can sometimes peck at the emerging seedlings, particularly early on in the season. Cover sown areas and seedlings with row covers if this proves to be a problem.

How to Harvest Salad Onions

Salad onions are typically ready to enjoy 10 to 12 weeks after sowing, though at the height of the growing season it can be as soon as 8 weeks. Harvest the largest plants first so that those left can continue to grow. This way you can extend and maximise your harvest.

Store your salad onions in the refrigerator or slice them up to pack into freezer bags or containers to add to recipes whenever you need a boost of fresh flavour.

Salad onions are reliable, versatile and downright delicious – we wouldn’t be without them, that’s for sure! What about you? Comment below or head over to our Facebook and Twitter page.