Welsh onion: Sowing, planting and harvest calendar
How to sow Welsh onions successfully under cover?
To start Welsh onions under cover, use clean pots or module trays with drainage holes. Fill them with seed compost and sow the seeds shallowly, following the seed packet instructions. Cover them with a thin layer of compost and water gently.
Spring sowing gives you plants to put outdoors when conditions are suitable. Autumn sowing depends on the variety and climate; it is not suitable in every situation. Keep the containers in a bright place at a temperature suited to germination. Avoid overheating behind glass and ventilate the greenhouse.
Keep the compost moist without waterlogging it. Once the plants are well developed, gradually acclimatise them to outdoor conditions before planting in well-drained soil. You can also grow them in a larger pot with drainage holes.
Label containers with the variety and date to follow germination without mixing up batches. The first narrow leaves need sufficient light to stay sturdy. Check moisture by touch before watering and empty saucers that retain water. Aim for steady growth before planting out: a moist, cohesive root ball transfers more easily than dry compost that falls away from the fine roots. Observe the seedlings themselves rather than relying only on a fixed number of weeks.
How do you sow Welsh onions outdoors?
How do you plant Welsh onions in your garden?
How to care for this plant
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Weed
Remove weeds around young bulbs, especially if they shade them. Close to the plants, weed by hand to protect the roots and avoid damaging the bulbs.
How do you harvest Welsh onions?
