Anonymous added on August 17, 2017 | Answered

My friend is having a problem with his compost. The compost have gray on top. Is this mildew

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Certified GKH Gardening Expert
Answered on August 18, 2017

If this is not yet "finished" compost, then this is probably just normal, healthy decay occurring with the organic matter in the compost. It might be fungi or actinomycetes. This article has more information:

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