The greenhouse is one of Lillian's many facilities. Students often take refuge in the greenhouse in times of distress.
Notable incidents include:
- Yumi comforting Sachiko after she runs away during a play rehearsal.
- Yumi happens upon a depressed Rei in the greenhouse after Yoshino returns her rosary.
- Sei and Shiori waiting in the greenhouse during a rainstorm.
- Yumi runs to the greenhouse in tears after an argument with Sachiko.
- Sachiko hid her card beneath the Rosa Chinensis bush.