Dying Geraniums

I bought these Geraniums from Morrisons, they were beautiful with no problems.
I put them in My Polytunnel they were deteriorating, I thought they were too cold (Temp dropped to 5 - 8 degrees C.
I repotted them and removed the affected leaves, put them in my greenhouse where I thought they would be warmer but as you can see they are still deteriorating.
I am lost and looking for suggestions on what the problem could be.

 

Hi @Belto ,
Is your greenhouse heated?

The thing to remember is Pelargoniums have to be kept at around 5 deg or higher including nights . If they're established plants ( I don't think yours are they look like this years seedlings ) then they will tolerate freezing temps as long as they're kept bone dry.

Can you not move them onto a windowsill indoors? The plants themselves look to have good growing points on them, it's just the larger leaves dying off.

 

Belto, a combination of sudden colder temps and I wonder if you over watered too??
Resist watering, carefully remove affected leaves and avoid over fussing them.
As long as they don’t rot off I think they will be fine, eventually

 

I agree, lots of plants are forced in absolute perfect growing conditions, they then get put in draughty shop fronts with no hardening off.
Pelargoniums (geraniums) are one of those plants that are likely to spring back once things warm up properly.

Just dont overwater.