In particular, Gibberellic Acid (GA3), Naphthalene Acetic Acid (NAA), and Triacontanol at varying concentrations (T1 to T9) were tested for their effects on the germination, growth, and yield of sweet basil (Ocimum basilicum L.). The results show that the most successful treatment for improving the majority of parameters was GA3 at 300 ppm (T3). In addition to attaining the highest germination percentage (91.5%) and survival percentage (82.6%), this ideal treatment dramatically shortened the time required for seed germination (9.32 days) and 50% germination (19.3 days). The GA3 300 ppm treatment also optimized vegetative development, leading to the maximum plant height (44.67 cm at 90 DAS), the most lateral branches (32.75), the most leaves per plant (91.5) 10, and the largest leaf area (31.33 cm2). This resulted in the highest herb dry weight (20.82 g/plant) and fresh weight (36.78 g/plant) possible. Triacontanol at 300 ppm (T9) was found to yield the highest stem diameter (8.33 mm at 90 DAS), despite GA3 dominating. The control group (T0), on the other hand, continuously performed the worst across all assessed attributes. In conclusion, Gibberellic Acid at a concentration of 300 ppm is recommended as the ideal PGR treatment to promote rapid germination, robust growth, and high herb yield in sweet basil cultivation.
