Planting Onion Sets Outside in Autumn
Planting onion sets outside in autumn is simple and rewarding. This season, I’m planting Senshyu Yellow and Electric Red varieties, both perfect for overwintering. Proper spacing is key for healthy growth—individual sets should be 15 cm apart, with rows spaced 30 cm apart for plenty of room to develop. With a bit of preparation, you can set the stage for a productive crop. This guide walks you through every step, from bed preparation to protecting your sets, ensuring the best start for your onions.
1. Prepare the bed to a fine tilth, removing any large stones or debris.
2. Stretch a string line across the length of the bed, this will be used as a guide.
3. Use a dibber to create the first hole, approximately 3 cm deep (adjust for the size of the onion set).
4. Measure 15 cm along the line and create the next hole. Tip: Use a 15 cm length of wood as a handy gauge.
5. Repeat until you’ve made holes along the entire row.
6. Place an onion set into each hole.
Note: Avoid pressing the onion set too firmly into the soil, as this can damage the base, or basal plate, of the set.
7. Cover the sets with soil and gently firm in.
8. Mark the start and ends of each row, then remove the string line.
9. Water thoroughly to settle the soil around the sets.
10. Temporarily cover the bed with fleece or fine netting to protect the sets from bird damage.
Once your onion sets are planted, the hard work is done! With proper care, you’ll soon see the first shoots emerging. Make sure to keep the bed protected from birds, especially early on, and check in regularly for any signs of pests or disease.
