[Mary15?]

Hello,
First time on here,
I Have planted my Kelsae onion seedlings out in raised bed today I have planted them 12" apart now someone as told me they should 20" apart have I planted them close Thank you
Mary

[New shoot]

Hi Mary and welcome 

With the giant onion types, the more space you give them, the bigger they get.  You should be fine with your spacing, unless you are after really mammoth onions to show.

[mumofstig]

Hi there, welcome to the forum
According to Mr Fothergills

Plant out into your onion bed in late April to early May, approximately 30cm (12”) apart.

Onion The Kelsae Seed from Mr Fothergill's Seeds and Plants

The only reason to plant them further apart, I think, would be if you were trying to grow giant onions for exhibition. Snap NS

I'll move this over to GYO, now.