his study aimed to investigate the effect of foliar application by synthetic and natural growth stimulants (salicylic acid (SA), selenium (SE) and orange peel extract (OPE)), on vegetative growth, oil production and the total phenolic content of Ocimum basilicum thyrsiflorum L. essential oil. A pot experiment was carried out and the treatments of foliar application ((SA) at (0.5, 1 and 1.5 mm), (S...