I've been trying to figure out the best foliage creation workflow for myself and I think i'm getting closer to something i'm comfortable with. So, I made the grass with Zbrush Fibermesh and baked the Normal, Vertex Color, Alpha, and Cavity map using Xnormal. Then I made two low poly cards inside of Maya, exported them and placed them procedurally with SpeedTree's generation tools. This single patch is 264 tris. Soon i'll move onto trees and other plants but in the meantime, check out these screenshots.