We assure you - they are not withered or destroyed! This happens because the air in the rooms is dry (less than 40%) due to the intense operation of the heaters and mosses have given up fully the moisture, and then have undergone a hardening process. This is absolutely normal and should not bother you! Just avoid touching them. Mosses will again absorb moisture and soften when normal air humidity values are restored - either naturally or by placing a humidifier for the air, which is highly recommended for people's best living conditions. Do not hesitate to contact us if necessary.