onions bolted!?

Just noticed today that 2 of my onions have bolted (am I understanding that term correctly? i.e. flowered, going to seed?)

Not entirely sure what I can do now, to the flowering onions or to avoid the others doing the same?

Any advice?

Cheers

Mick

And make sure they don't dry out. My soil dries very quickly and I always water the onions. Give a general feed fertizer. I conserve moisture by covering with a thin layer of grass cuttings.

Another 2 have bolted!? Now it's had  lot of rain recently so it can't be due to lack of moisture....surely? 

BTW...how would I get seed from the flowers? is that possible?

Sorry Mickwood, only just seen this.

I haven't tried it for myself, but I assume it's the same as my Flowering Alliums.
 I let them flower, and die back a bit, then cover with a paper bag, cut the flower head off, tie up, and hang it upside down in the shed (or garage in my case) then 'bobs y'er uncle'

Although I might be completely wrong, and someone much more knowledgeable will no doubt advise you.....