To get large onions, you need to sow early. I don't grow for champion sizes, but do like a large onions so I get started as soon as the Winter Solstice is here. Which is today. So I've sown my first batches of onions. 7 Varieties. Morada De Amposta - Rossa Savonese - Simane - Tropea Rossa Lunga - Long Red Florence - Rossa Savonese.
Sown into little pots - about 100 seeds per pot - covered with grit - watered and stuck into the prop [again, not heated, just with the lid on].