Answer: There are several products you can use but they may need to be applied every year, with the exception of the zinc strip which you can place on the ridgecap of your roof. You can use either liquid or granular moss killers on your roof. If possible, apply them during a dry spell. Controls containing zinc sulfate are relatively safe around plants and are available for home use. Zinc sulfate also comes in a granular form for dry application. Follow the label directions. Zinc sprays or granules will corrode copper so should not be used if gutters and downspouts are made of copper. Best wishes with your project!
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