Yucca linearifolia ‘blue form’, also called Y.linearis. It has flexible, short green leaves up to 30-50 cm long, forming a perfectly spherical head. If through circumstances the base of the trunk is rotten, it can be cut off and the plant will make new roots via de outer trunk layer. Another remarkable quality is that if the crown is rotten you can treat it for mould and this plant will make new crowns. This plant can withstand temperatures down to -15 degrees Celsius.