In Northern Ireland, spring onion sets like Sturon, Snowball, and Red Karmen can be planted from early March to mid-April. For overwintering onion sets such as Troy F1 and Senshyu Yellow, plant from mid-September to late October.
Northern Ireland’s temperate, maritime climate makes it possible to grow onions in both spring and autumn, though well-drained soil is essential due to higher rainfall.
Ensure the ground isn’t waterlogged before planting. Use fleece or mesh tunnels in more exposed areas to offer protection from wind and heavy rain.
Yes! Onion sets grow well across Northern Ireland. Spring planting is reliable in most areas, and autumn planting works well when done early enough to establish before the first frosts. Raised beds or mounded rows help keep bulbs from sitting in wet soil.
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