A bit of felt enhanced with yarn, paint, sawdust, jute and ground foam. Wet matte medium also features prominently.
I had a sprawling bit on using felt as a grassy material but I’m not sure I agree with all of what I wrote when I was putting the piece together. It’s been a while. The main take away is that felt is cheap. The material can also be teased up to represent leafy plants layered and nested along the fast growing right of way.
AH
Cascade Division 