There is what looks like black mold spores on my rough hemlock raised vegetable planter. The wood was pretty wet when purchased and was not stored properly - so I know how it happened. I just don’t know what to do about it, if anything.

My plan was to put landscape fabric on the inside of the planter. Do I need to clean/bleach off the mold before I do that? Won’t the fabric up against the wood just create a new dark and damp environment for more mold? Given that mold is all around is this an actual issue or maybe just a cosmetic problem?

Appreciate any advice. Thanks!