That looks like the brown & light green felt available from Hobbycraft. Their mid green is too much like British racing green for my liking. I supply heathered felt (see ebay) which is kinda mottled for the one piece forests that I sell. Having said that, I don’t actually use felt footprints in games when I have a tree canopy to denote the boundary.
Enjoy your gardening
Les & Alison
