Oriental hybrid lily flowers have a nice fragrance. Especially in a confined space, however, the scent can be perceived as too strong and therefore unpleasant. Lilium cv. ‘Casa Blanca’, a typical oriental hybrid cultivar, has a large pure-white flower with strong smell. We clarified that the compounds responsible for the strong fragrance of ‘Casa Blanca’ are aromatics. We succeeded in decreasing the emissions of scent compounds and made the fragrance milder throughout the period of use as an ornamental by application of an inhibitor of PAL. Here I introduce the characteristics of floral scents, the scent suppression method of lily and the outline of development of fragrance suppressor for ornamental flower.