Bark Mulch is Molding

I recently put down weed blocker and then covered it with a mixture of small bark wood chip mulch and cocoa shell mulch. There are large areas that look covered in mold. I went to break it up and it "dusted the air". Is this dangerous? The area is dewy in the morning and doesn't get more than 5 hours of direct sunlight, if it's even a sunny day. How can I prevent/remove the moldy areas?


Hardiness Zone: 10a

Julie from Redondo Beach, CA

January 24, 20090 found this helpful

Don't breath the dust from mold. I suggest to spray the mold with bleach, or remove it, and spray the area with bleach. Do this till it goes away. Good luck.

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February 17, 20090 found this helpful

While bleach would certainly kill the mold, it would also kill everything else around, and make you just as sick as the mildew growing on this mulch. Most likely it is not a harmful mold, very few are. I'd try spraying a little vinegar on the top layer, and once it's dry, spread the mulch out. Sun should do the trick as well.

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