What Kind of Green Mold Grows on Carpeting?


Green mold forms when material is left damp for long periods of time. This is particularly common in bathrooms, laundry rooms and anywhere else where water is used regularly. Several types of green molds are commonly seen infecting our homes. Some are dangerous, and some are merely unsightly. Treat these molds by identifying and eliminating the conditions that favor them.


  • Aspergillus comprises a group of approximately 200 species. Its natural habitat is hay and compost. Aspergillus thrives on damp carpets. It appears as a dusty mold that looks dark green or brown. Some species of Aspergillus are dangerous to humans, although the type that typically grows on carpets will only exacerbate asthma or cause respiratory problems in those who have weakened immune systems.


  • Cladosporium is one of the most common molds that grow in homes. Often referred to as "black mold," it can appear black, brown or dark green. It is usually found on hard surfaces, although it can grow on carpets and other fabrics. It appears as a stain on the carpet that grows slowly. Cladosporium can trigger serious rare allergic reactions, particularly when the patient is exposed to it at high concentrations.


  • Penicillium is another common mold. Penicillium can be blue-green or white. It also grows on carpets and other fabrics as circular and slightly fuzzy molds, often with a blue or green center and a white ring on the outside of the mold. A heavy musty odor can often be smelled. If penicillium is present, this is a sign that your carpet is rotting. This mold can cause a variety of allergic conditions and acts as a food supply for storage mites.


  • Stachybotrys is a less common mold that normally grows on wood and other cellulose-based products. It is a greenish-black color and appears as a stain. It can be transferred to carpets from water-damaged wooden flooring. It produces a toxin that gives you a rash when you touch the mold. Other symptoms include fatigue, diarrhea and flu-like symptoms.

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