In a blender cycles project I am working on, I made a scene that includes grass, and it all renders fine, but there is a rather serious green tint in the shadows under the deck. The lighting is a flattened sphere with the normals turned inward and a sky texture node applied to it. The grass has a simple dark-green hair texture node. Farther out, I have a flat plane that is also green, with a noise texture and color ramp to generate a sort of clumpy grass look.
I definitely don't think I would see a green tint in real life, but I don't think a camera would have it either. I thought it was kind of interesting that it had such a sunrise/early morning feel to it when the sky texture has the sun straight overhead.
Light Sphere nodes:
- Sky Texture - Preetham, Turbidity 2.2, Vector from Texture Coordinate: Object Vector
- Emission texture - Strength: 1, Color from Sky texture
- Hair BSDF - Color: Dark green, both roughness set to 1.0.
Grass plane nodes:
- Diffuse BSDF - Color: varied dark green, roughness: .358