Q.Why Is My Festuca Gtass Gone Green Instead Of Being Blue?
They were fine last year but now they are turning green. They are in full sunlight at the top of my pond.

Certified GKH Gardening Expert
Unfortunately, your photo did not come through.
There are a few common causes for these symptoms in Fescue. It could be that the clumps are crowding and need to be thinned out. Also, soils that do not have a chance to dry out some between watering can have this effect. And less commonly, they will do this in response to a lack of nutrients. Generally, fertile soils will not have this problem.
Here is an article that will help you with their care: