the ratio of petal/flower is less. therefore, extraction of essence will be economic, when quality of petal essence be more than flower (sepal+petal) essence
The main difference between petal and flower essential oils is that green phytons have more quantity of alkaloids and tri-terpenes, streols, saponins with glycosides, but in flower citral, menthol, gereniol, and other alcohols of highly volatile nature or acetates or esters and acids are mostly found.