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The main object of this paper is the use of biostimulants on the levander's growth and developement, as the title is. Specifically, the experiment that was processed on the farm of ATEITH aimed to highlight the stress or lavender from factors such as silicon and salt. During the study the lavender plants were sprayed 5 times with solution 50 κΜ NaCL, 100 κΜ NaCL, 150 κΜ NaCL,100 κΜ NaCL+0,35 κM Si, 0,35 κM Si, in groups. After each spray, the plants were measured with a ruler. After 2 months, measurements were made with the fluorimeter where a change in the maximum photochemical efficiency (Fv / Fm) was observed. Specifically, in the first measurement we had a reduction of the ratio in relation to the control, in the treatments 0.35 κM Si, and 100 κM NaCl, while a recovery of the ratio was observed during the 2 nd measurement. In the P.Index efficiency index, as in Fv / Fm, a lower percentage on the control was found in the 1st measurement in the treatment with silicon 0.35κM Si, while in the 2nd measurement it was the highest percentage on the control. In contrast, 50 κM NaCl treatment had the highest percentages on the control in the 1st measurement and the lowest percentages in the 2nd. In addition, the parameter of the photosynthetic efficiency index (P.Index), decreased compared to the control in the 1st measurement in the treatment with silicon 0.35κM Si, while in the 2nd measurement it increased significantly. In contrast, the 50 κM NaCl treatment had the largest increase compared to the control in the 1st measurement while a decrease was observed over time (2nd measurement). In terms of plant height measurements, there were changes in all treatments. In particular, the plants treated with 50 κM NaCl had the best growth compared to the control plants, while on the contrary the treatment with 100 κM NaCl showed the lowest growth. Finally, in the collection of inflorescences, in all treatments were observed small percentages, from 50% and lower, compared to the witness. The smallest percentage on the control we had was in the treatment with 100 κM NaCl + 0.35 κM Si with the percentage drops to 23%, about ¼ of the control.