Moss will not hurt the installation of pavers. So use a paver that has a wider gap, such as tumbled or permeable pavers. Then you mix peat moss,sand, and moss spores in the cracks. It is that quick and easy. Some people want moss on retaining walls by pour buttermilk over wall and putting the moss spores down. The buttermilk sets the cultures up to start growing. You can now buy a jar with the moss and yeast premixed.