Vance Wood
Lord Mugo
I've had luck cultivating moss after repotting if I apply a thin layer of shredded white sphagnum moss after repotting and then pressing it firmly into place to ensure good contact.
Some observations, the year I started doing this, I had much better root growth and roots that happily colonized even the top layer of soil despite being in the full sun. Another benefit was that I had far fewer weeds to contend with.
On a recent trip to Japan, almost every tree I saw had a healthy surface layer of living colonized moss.... So the"for show" thing may be true to a small extent as it would be dressed up a bit.. I asked about this and was told it was cultivated there and desirable for better root growth, fewer weeds and for preservation of the soil. Akadama breaks down due to wear and tear from water, wind and sun. Adding moss will protect and immobilize akadama and help it stay intact longer.
Thank You very much for sharing that bit of information.