The Q&A Archives: Wood Chip Mulch - How Do I Maintain It?

Question: When we bought our Seattle house last year, most of the garden had wood-chip mulch around the plantings (which are doing fine). Depth is between 4 - 8". I've noticed that under the first couple of inches, there is a powdery white/grey substance throughout that I guess is either fungus or mold. Is this harmful? Should I be turning over the mulch each year with a rake to mix it up? Thanks!


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