Yamagoke is the go-to for a surface covering after repotting shohin & mame bonsai, and for shallow-rooted species like azaleas, crepe myrtle, etc.  It is leaps and bounds better than sphagnum moss.  It readily re-wets, it is a naturally smaller size, permitting it to nest better to resist being removed during watering, and in some cases "comes back to life" during the growing season. Being a true moss, it will not invade your soil with roots, should it spring back to life, but instead give you a nice, green carpet over your soil.

Each brick is 8 liters dry, extremely densely packed and will cover a great number of trees.  If you wet too much, simply let it dry out and then add it back to the package.  There is literally no waste.  The previous supplier of yamagoke (with the picture of a man on the left side - images below) went out of business in 2018.  We have secured a new supplier of yamagoke and should have no problems keeping it in stock at all times.  The package does *not* look like the one pictured with the little man, but is the same type of dried moss in the same quantity.