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Big Onions

I'm thinking about growing big onions but don't know any varietys or where to get them any ideas?
Thanks
Baz
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Thanks Verdun
I grew mid sized ones last year which were great .Reason i want to grow big one is i own a bakery and make cheese and onion quiche and big onions would be ideal for them.
Thanks
Baz
Robinsons has been a supplier of giant onion seed for as long as I can remember. Also some garden centres sell young plants of Kelsae & Ailsa Craig, which (IMHO) is a very good way of getting started.
Robinsons are my choice too Baza
We have allium leaf miner here, anyone know of a biological controal please? Or is it just a physical barrier to keep them out?
I generally get my onion seed in at the beginning of January, but it has been so cold this year I haven't put them in yet.
I have Robinsons Mammoth seed. Last year I had Kelsae as well.
The soil need good preparation. I use well rotted manure, Blood fish and bone, and calcified seaweed.