Over the past week or so I have been trying unsuccessfully to buy onion sets. Apparently there is a shortage of sets in the UK due to the wet weather during the summer. My local garden centre have sold out and are unable to source any more.
I've always grown onions from sets but I know that they can be grown from seed. This article suggests planting seeds in January or February at 50-59C which I would not be able to do as I have no heated greenhouse. I have read that seed can be planted directly in the ground around March - April but as onions need quite a long growing season I wondered about the size of the crop raised this way. Alternatively I could start the seed off in March in my new mini greenhouse, which would extend the season slightly.
Does anyone have any tips as to the best method of growing onions from seed?