Snowbelle Mock Orange. 'Snowbelle' is 3' compact grower which has very fragrant double white flowers. It seems that the best fragrant Philadelphus all have double flowers. Mock Oranges fill that flowering gap between the early spring flowering plants in April and the later summer flowering woodies in the summer. These bring a refreshing display in late April and May with their pendulous branches clad with these pure white fragrant jewels. There is not much fall color for us with this genus, but the flowers more than make up for this shortcoming.