Climbing Roses advice please.

I grabbed three climbing roses at a local Poundland before they rapidly disappeared.I figured if they weren't much good it was worth a three quid gamble.
I've kept them moist and all three are shooting like mad...the instructions on the box say plant out as soon as possible...this weather??
Should I pot them and put in my cold greenhouse for a couple of months?

 

That is what I would do then plant them out when the ground warms up a bit. What a bargain!!

 

In my experience Roses can be planted out pretty much any time the soil is soft/warm enough. It's frozen around our way at the moment so I'd wait until it warms up a bit and then plant out.