I did try a few things before I settled on using tulle based embroidery. It's direct and quick and a method I'm very comfortable with. The fact the tree trunk was flat, raw applique, the moss felt best staying flat.
A variegated green thread gave it some character.
How much more I need and how much will simply be covered over ........?
These little bits were stitched onto hooped tulle and cut away. Any remaining tulle will be lost in the background.
A few stitches of the green variegated thread anchors the little bits.
As a whole, this amount of moss may seem a bit light given the size of the tree.
I can add more at anytime.