weak cucumber stems?

My cucumbers seem to have developed thin , weak stems as they've started to grow more rapidly. They've been inside bar one evening when I made the mistake of putting them in the greenhouse when it was too cold (Lesson learned). Will they be ok?

 

plant them in a deeper pot and bury the stem , as from your photo it looks like the stem is matured enough , the stem will root into the fresh compost , I would keep in the greenhouse and cover with fleece that should do the trick and just water in the morning , no later as the compost will be drier over night which will help the plant.

 

Thanks! Have done that now. Was surprised how pot bound they were so hopefully they'll do better now