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in Fruit & veg
I only grow sets these days and have been consistently harvesting tennis-ball sized onions for the last few years, since I started using a heat-treated variety called 'Setton'. I start them in modules (the 24 to a seed tray size) in my unheated greenhouse as soon as I get them and plant out when they have good roots (usually they are about 6-8 inches high by then.) Clay soil here and the only feed they get is a trowel full of garden compost used when planting. I only started doing this to prevent blackbirds/squirrels pulling up the sets, but it worked so well I wouldn't do it any other way now.