Wet it and forget it, is the solution. If you apply it inline with the directions, the moss will die with in a few weeks... I have not had any issues with plants, grass etc. dying off after it washes off the roof with rain.
It has taken me almost 10 years to go through a 64 once bottle... I have used it on Decks and roof.... and apply it say every 3 or four years...
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Life is about how much time you can spend relaxing... I do it on an island that isn't really an island.....
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