This is what happens:
The grass doesn’t react to light strength changes or color changes! 
Why doesn’t this happen? What could it be?
It’s difficult to tell from that screenshot, but maybe your grass mesh is using an unlit shader. Try changing the grass material to the standard shader with rendering mode set to “cutout”
I am using unity4 and even if i set the material to diffuse it does not react to light in any way shape or form.
Are the objects in a layer that isn’t included in the light’s culling mask? I think I see them casting shadows so that probably isn’t it but it’s worth checking.
No they are not…
They are a parent of the chunk they are in… that is the only difference btw the chunk you see (terrain) and the grass…