I think it depends.
Moss likes acidic, low pH. Wood ash is potash, and is higher pH, alkaline.
Looked on Google:
How to grow moss: http://www.mossandstonegardens.com/blog/how-to-grow-moss/
Then I came upon how to grow morel mushrooms...
- Brian
The composite decking on my little porch is deteriorating, and does get slick.
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