Foliage turns black after I build lighting

When I build my lighting most of my foliage turns black. This foliage was painted with the landscape tool and is set to not cast a shadow.

Any ideas on what could be causing this? It actually looks about how I want it to look until the lighting builds.

Could be your material, could be your lightmap/lightmass settings, could be your Light settings.

Disabling shadows on the grass doesn’t mean they won’t receive shadows from other objects.
however it seems more likely that what you are getting is a lightmap error.

Also, for grass you probably want to use the landscape Grass node in the material.

What’s the benefit of that over painting the foliage?