How to Grow Onions in the UK

Onions are a reliable and easy vegetable to grow in the UK. They don’t need much space and can be grown in garden beds, raised beds, or containers.

With the right soil, regular watering, and a sunny position, onions usually grow well for beginner gardeners.

Onions can be grown from sets (small bulbs) or from seed.

Choosing onion sets or seeds

Many gardeners grow onions from sets, which are small onion bulbs planted in spring.

Sets are easy to grow and usually produce reliable results.

Onions can also be grown from seed, although this takes longer.

Both methods work well in the UK climate.

Onion sets are usually planted in early spring when soil becomes workable.

Push sets gently into the soil so the tip is just visible.

Space onions so they have room to grow into bulbs.

For planting advice, see when to plant onions in the UK.

Onions grow best in:

Adding compost before planting helps improve growth.

You can read more in best soil for vegetable gardening in the UK.

Onions need steady moisture while growing, especially during dry weather.

Avoid letting soil dry out completely.

For watering advice, see how often to water onions.

Onions can grow well in containers if they have enough depth and compost.

Containers should drain well and be placed in a sunny position.

For container advice, see growing onions in containers.

Onions are usually ready to harvest in summer, when leaves begin to yellow and fall over.

Allow onions to dry before storing.

For harvesting advice, see when to harvest onions.

Onions are one of the easiest vegetables to grow in the UK.

With simple care and good soil, they usually produce reliable harvests.

laura tennantFebruary 11, 2026