Lilly Pillies are native to Australia. Give them native fertiliser, not one of the all-purpose jobbies.
Rule of Thumb
The more formal the hedge the more pruning required and the LESS flowers produced as, in general, flowers are produced on last year’s growth. Prune it off and there won’t be many flowers.
Did You Know?
Murraya is related to Citrus, which is the reason for the Orange Blossom scent of the flowers.