Answer: The moss is growing because the area remains too wet for too long. The bricks are stopping the water flow and it puddles up adjacent to the bricks. You might try aerating the soil along the brick line by poking holes 6-8 inches deep every 6 inches along the brick border and then sprinkling sand along the lawn side of the bricks. The sand will go into the holes you made and provide a way for excess water to drain away from the lawn and below the bricks. This improved drainage should keep additional moss from growing. As for the moss that is there now, you can either peel and pull it out or use a moss killer.
Good luck with your yard!
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