Onion question dont laugh I am being blonde

Usually ready in late July, when you see the tops starting to go a bit brown or they start flopping over. They're on a cycle similar to garlic which ripens close to the same time and has similar habits. If in doubt, ask a plotting neighbour, but it's usually obvious that the onions' season is over.

Thank you ay least I know now.

The greens are huge I never realised they got so big, one looks like its set to flower is that ok or do I take the flower out  sorry the blonde is still active

Hi gardening people, may I join this thread with another onion question? I had my onions under clotches to try and keep the wildlife off them but during the recent high winds, one of the clotches broke free and was flapping about. By the time I found what had happened it had decapitated the leaves of a load of the onions down to ground level. Will the onions grow more leaves or should I try planting some more? Am I too late to plant some more? 

Yes, remove the flower stem and use it first as it will not store as well.