Mold and mildew are fungi that occur in moist locations. They also require organic food sources, like wood. If a wet flower bed with wood-chip mulch is adjacent to your house, mold and mildew that occurs in the flower bed may transfer to the house.
About this Author
Marie Notnats enjoys learning about new topics and teaching people new skills. She has been writing professionally since 2008. She is a professional horticulturist with a Bachelor of Science degree in horticulture from Brigham Young University. She writes for About.com, Examiner.com, eHow, and assorted gardening blogs.