How to set material of the grass made by particles hair? (in new scene)

Support Particles and Physics Simulations
1

I bulided grass model follow the tutorial of Blenderguru.com – “Create Realistic Animated Grass”.
I mapped to the grass group, after I rendered, the grass group is green,
but I mapped to the particles hair grass, after I rendered, the grass still gray, not green.
even I set the particles hair grass’s material diffuse green, after rendered, the grass still gray, too.

When the Viewport Shading is Texture, the grass group is show green, but the particles hair grass is gray.
Where I make some mistake? How to set material of the grass made by particles hair? ( I using Blender 2.65a.)

2

Sorry disturb you… I found where is the mistake:
I add new scene by full copy, but have no new group copy, the group of grass still use the old object,
I set material for new grass in new scene, and I don’t know the group not include the new grass,
so, particles hair grass use old group still has not material too.

the solve way is:
select the new grass build new group, let particles hair grass use new group.
Thanks all.