I haven't grown onions since moving here as it seemed silly to use the limited space when they are one of the cheapest veg to buy. Then last year my sister gave me a few sets she had spare and they reminded me how good it is to have different sizes and fresh too.
I decided there would be room for a few and ordered some of the heat treated ones as they - hopefully - don't go to seed so readily. We always grew heat treated at the smallholding as we had such dry weather there.
Heat treated sets need planting out as soon as they are received and the weather was perfect so now there are 5 rows across one of my vegetable beds. I was glad it was just one net as it's a bit of a back breaking job.