ROOM PLUS Eucalyptus & Clary Sage Series perfectly represent clary sage and eucalyptus. Eucalyptus and Clary Sage essential oil are 2 of the most widely used essential oils, both of which are steeped in history. Sage is the most holy and popular herbaceous plant associated with spirituality. Among all kinds of sages, the clary sage is specially used as medical plant to prolong life. Romans named it holy grass. The fresh aroma of eucalyptus has the effect of nursing respiratory system and immune system.