Muro

Muro is a term that refers to facilities to protect bonsai trees against damage from frost, freezing or snow in the winter season. A prefabricated house, plastic greenhouse or any other closed chamber is fine for a muro, as long as it can maintain a suitable temperature and humidity for the bonsai. Muro are especially important for tropical and semi-tropical bonsai, which cannot tolerate low temperatures. Some bonsai enthusiasts in Chicago use muro to keep their bonsai alive during the harsh winters.