cucumber preferences

we've got 2 cucumber plants (which we bought) in a growbag inside one of those mini greenhouses. they dont look happy! one i am sure has died (yellowing of the leaves) and the other looks like its going the same way! they seem neither too wet nor too dry.
i was wondering if the fact that the greenhouse is in full shade makes a difference? do cucumbers prefer partial/full sunlight?
tia :gnthb:

 

I can't take you to ceriously with a name like RandyRos lol.
No greenhouse however small should be in allday shade.
I suspect they are suffering from the cold.

 

right, thanks. i will get hubby to move them then.
as for my name, it was given to me at skl and stuck lol

 

Need a minimum of 10C - probably too cold in the grow-house at night :(