Can tatami mats get moldy?

Yes, because the rice straw core is a natural material, tatami can develop mold or dust mites if kept in a damp, poorly ventilated space. Keeping the mat dry, avoiding shoes on it, and airing the room regularly helps prevent this. Lift and fold your futon during the day to let your tatami mat naturally breath. Lift your tatami mat every now and then to air out both sides of your mat unless it is your floor. Wool mattresses help to keep your tatami mat clean and dry.