Moss between paving blocks

If you already have moss growing nearby you already have your spore source (moss doesn't grow from seed). The trick now is to create conditions in your paver blocks that will contribute to moss growth. If your blocks are recently installed concrete pavers, the moss is being held back by the alkaline condition of the concrete itself, which will leach out in time. The time required depends in large part on the amount of rainfall you get and (particularly back east) its acidity. You can accelerate the process by mixing non-sterilized cow or horse manure together with buttermilk and brushing the mix on the pavers. I have never successfuly transpalnted moss to a rock or concrete surface; I tried a few times without success and subsequently learned I'd been wasting my time.