Mold starts as a spore, and when that spore finds the right conditions and lands on a moist nutrient source, it will begin to propagate. It grows into what appears to be a circular spot, called the mycelium. The mycelium is made up of vegetative filaments called hyphae. The forming of these hyphae is called the growth stage and can occur in as quickly as 24-48 hours under the right conditions.

The hyphae then begin to expand and branch out, forming a mat that penetrates and latches onto the surface that the mold is in contact with. Eventually, mold spores will be released by the hyphae and the cycle will continue. The kind of mold that occurs and how quickly it reproduces varies greatly depending on the conditions.

Most of all, mold needs moisture to grow. Because of the prevalence of mold spores, it can grow whenever the conditions are satisfied, even if there is little to no light. Places where mold typically grows are dark, damp environments with little light and air ventilation.

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