Plant normal growth and development may be restricted due to water deficit; Therefore, many chemicals have been used to reduce the harmful effects of drought. Salicylic acid can increase the plant’s tolerance to drought. Sunflower (Helianthus annuus L.) is a flower that has many benefits, as it produces the largest vegetable oil in the world. The study examined how normal circumstances and three levels of drought stress (75%, 50%, and 25% FC) and salicylic acid (SA) at 20 mg/L affected sunflowers. This investigation demonstrated that the pH value of the soil considerably dropped to levels lower than the controls, and soil EC increased considerably under each studied water stress level. The value of plants' fresh and dry weight rose after SA treatments. While the SA treatment enhanced the leaf RWC, it did not affect the shoot or root length. Under all examined water levels, SA treatments enhanced the amount of plant pigment in comparison with the samples that were not treated. These results show the importance of (SA) in increasing plant tolerance to drought stress

Keywords : Plant Growth, Salicylic Acid (SA), Sunflower, Soil PH.