The present study was carried out in two successive seasons of 2014/2015 and 2015/2016 at the experimental farm of Horticultural Research Station, Sabhia. Alexandria governorate, Egypt to study the effect of NPK and biofertilizer on vegetative growth characters, vitamin C content and chemical composition of the essential oil of Celery and Dill plants. Results revealed that the fertilization treatments differently affected the mean values of all studied characters. The application with bio fertilizer (CPP) + 50% NPK significantly increased vegetative growth characters i.e plant height, , fresh and dry weight of aerial parts  at two cuts as well as total chlorophyll and carotenoids, Vitamin C % during both seasons. However, the application biofertilizer (CPP) + 50% NPK  gave the highest of major's chemical composition of essential oils i.e Apiol, Myristien, ß. Pinene, Limonene and ß- Phellandrene percentages during first cut of 2014/2015 season. This investigation suggests the need for more studies concerning the effect of NPK fertilizer and biofertilization on Celery and Dill plant under different environments using different types of soil to reach the optimum combination to achieve the best yield