Perimeter—or French—drains are basically a drainage ditch covered with gravel for the purpose of directing water away from certain areas like foundations. While French drains used to be constructed using spaced tiles, they are now generally constructed with perforated plastic pipes that can carry larger volumes of water and allow water drainage out the entire length of the pipe as well.
When mold spores find a hospitable area with sufficient moisture to grow they take hold and spread. They love surfaces of cellulose: paper and wood products being the most affected usually. In homes with infestations you will often see the black toxic mold growing on the drywall or wall paper.
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