UK gardeners grow onions from sets or seed, with sets being the easier method for beginners. Plant sets in March or April, spacing them 10cm apart in rows 25cm apart, with just the tip showing above the soil. Onions need 14-20 weeks to mature depending on variety. Popular UK varieties include Stuttgarter Giant, Red Baron, Centurion, and Setton.
Key takeaways
- Plant onion sets in March or April, pushing them in until just the tip shows above soil level
- Space sets 10cm apart in rows 25cm apart for full-sized bulbs
- Sets are the easiest method; seed offers greater variety choice and is cheaper per bulb
- Stuttgarter Giant, Centurion, Red Baron, and Setton are reliable UK varieties
- Harvest when the tops yellow and fall over, typically July to September
- Cure bulbs for 7-14 days in a dry spot, then store in nets for up to 6 months
onions vegetables grow your own allotment kitchen garden beginner friendly
Our team produces practical UK gardening guidance from source research, contributor records and established horticultural practice. Editorial standards are overseen by Matt W.
