Sue ! We have a lot of moss as well,....in the iris beds, perennial beds, AND in our crushed limestone driveways! I've heard the 'moss doesn't like lime", and "sprinkle lime on it", and "squirt it with vinegar " many times, and tried them all, and none seems to work for me !..........we scrape the worst off, and spray the remainder with Bayer's Moss and Algae killer.....which doesn't seem to hurt anything else, ....and that seems to "knock it down", pretty well, but, it always comes back 
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