World Of Onions

It's Time to Start Your ONION Adventures

The basis of so many delicious dishes, onions (Allium cepa) are an essential ingredient in every cook’s store cupboard. With so many tasty types of onions available, why not grow your own and try some of them out? Follow our simple guide to growing onions.

The best onion varieties to plant

With so many types of onions available, it can be difficult to choose which one to grow! Here are a few of our favourites:

  • Onion ‘Stuttgarter Giant’: produces firm, tasty, slightly flattened bulbs, good for storing.
  • Onion ‘Red Baron’: a late maturing variety with dark red bulbs, stores well.
  • Onion ‘Jetset’: an early maturing variety with yellow-brown bulbs, stores well.
  • Onion ‘Sturon’: a reliable variety with good bolt resistance, producing flavourful round bulbs that store well.
  • Onion ‘Troy’: suitable for autumn planting, with good bolt resistance, producing tasty yellow-skinned bulbs.

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Onion growing equipment list

To grow onions at home, you will need: - Onion sets (like bulbs, but harvested earlier)
- Spade
- Fork
- Supply of compost or well-rotted farmyard manure such as Miracle-Gro Premium All Purpose Compost
- Fertiliser
- Netting

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When to plant onions

Some onion varieties can be planted in autumn for an early summer harvest, but the bulbs may rot in heavy, wet soils. The best time to plant onion sets is in early to mid-spring. Onions need a rich, fertile neutral or alkaline soil in full sun. To prepare the soil for spring planting, dig in lots of compost or well-rotted farmyard manure in autumn and leave it to settle over winter.

How to plant onions

Although you can grow onions from seed, it’s simpler to grow them from sets. Sets are young onion bulbs, grown especially for planting. Before planting in spring, dig over the plot, clearing it of all weeds and stones. Tread down the soil and rake it to produce a level surface with a light, crumbly texture. A couple of weeks before planting, rake in 35g/m2 of granulated fertiliser or 75g/m2 of dried chicken manure pellets. If you weren’t able to dig in compost or manure in autumn, then double the amount of fertiliser used. Plant onion sets 20cm (8in) apart, with the tips just showing above the soil. Allow 30cm between rows. Water in after planting – this helps to settle the soil around the bulbs. Cover the area with netting to stop birds pulling up the young plants.

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Caring for Onions

Follow these tips for a good onion harvest: Keep the plot well weeded.
Hoeing between rows risks damaging foliage and bulb tips, so weed by hand where possible.
Water regularly in dry periods.
Remove any flower spikes as soon as they appear.
Stop watering once the leaves start yellowing – this means that the bulbs are starting to swell.

Harvesting Onions

Spring-planted onions should be ready to harvest in late summer and early autumn. Autumn-planted onions will be ready to harvest from early to mid-summer. Once the foliage starts to yellow and topple over, the bulbs are ready to be harvested. Use a fork to lift them carefully, taking care not to bruise the bulbs.

Storing Onions

  1. Place the bulbs in a single layer on a drying rack or on a slatted shelf that allows air to circulate around the bulbs.
  2. Leave them outside in the sun or in a greenhouse for a couple of weeks to dry.
  3. Once the skins are dry and papery, store the bulbs in net bags or plait the foliage to form bundles.
  4. Store somewhere light, cool and well-ventilated. Bulbs stored in the dark are more likely to sprout.
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