Posted: 13/10/2013 at 09:08
A little net research gives four reasons for yellow or yellowing cucumbers.
1. They could be yellow-fleshed varieties such as the lemon cucumber
2. They have ripened past their green stage; we tend to eat our cukes before they are fully ripe and apparently they can taste bitter. Busy-Lizzie, I suspect this is why yours are yellow (or maybe in the cold they just stop producing chlorophyll which gives the green colour).
3. Over-watering which can rot the roots and stop the plant taking in oxygen
4. Some kind of virus, such as Cucumber Mosaic virus.
Christine, let us know if one of these reasons applies to your cukes.