Quote:
Originally Posted by Mr. V
I live near Portland, Oregon where it rains a lot and moss is always an issue. The best product I've found to kill moss on a roof is zinc sulfate,
and to kill moss in a lawn use ferrous sulfate. Both are available in large bags (forty to fifty or so pounds) at farm supply stores.
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This could be a cottage industry:
selling moss from lawns. 
$15.99 to $47.95 (per square foot or 2-pound bag).
https://www.google.com/search?q=spha...NhBXYQ_AUICigB
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