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This is my 3rd season on the lotty and the more I read the more paranoid I get in my first season just bunged it and hoped for the best.
Have just read that planting summer onions too early will cause them to bolt as they are two year plants intially concentrate on sending up leaves and then when a critical day length is reached in late spring the process of bulb formation is triggered.
In the second year the plant sends up flowers and sets seeds if sown too early onion plants mistake cold weather in spring as winter causing them to bolt.
The book says plant your onions out as early as possible to make strong plants by mid spring but not too early to avoid bolting.
But when do I plant them ???
Have just read that planting summer onions too early will cause them to bolt as they are two year plants intially concentrate on sending up leaves and then when a critical day length is reached in late spring the process of bulb formation is triggered.
In the second year the plant sends up flowers and sets seeds if sown too early onion plants mistake cold weather in spring as winter causing them to bolt.
The book says plant your onions out as early as possible to make strong plants by mid spring but not too early to avoid bolting.
But when do I plant them ???
... Start off with the biggies like Kelsae, then the standard mains like Sturon then the cluster mains (Long Red Florence for me) then the picklers (SY300)... You get a bigger choice with seeds than sets though I can understand people using them for the simplicity. 
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