In household use true; I am thinking of a scenario where exposed to mold and mildew. For example the way the prophet Ezekiel (iirc without checking the bible first) got a linen sash or belt, then stowed it at God’s direction in the rocks by a river. Later he was told to go fetch it, and the way it had been ruined was used by God as an example of how Israel had become useless to Him.
There are very few molds or mildews that attack Linen being almost pure cellulose... but it can be destroyed by the exudates from rotting bodies. Linen was the choice for sail cloth because of this ability to resist mildew and mold... but it will still rot eventually.