The ball of moss should be about the size of a large orange or small grapefruit. Cover the moss with aluminum foil or plastic and secure the ends with string, tape or wire ties. Check the moss every few days to make sure it is still moist. When the roots are well developed, cut the stem below the root ball and pot up the new plant. Air layering is slow, taking as long as two to three months.
Division is one of the easiest methods of plant propagation.
A crowded plant can be removed from its pot and cut into two or more sections. Each section is potted up separately. Division involving separating small plants may be more complicated. The best divisions will be those with good root development. When there are enough of these to furnish the desired number of plants, there is no problem.