This investigation was conducted to investigate the effect of plant density (145, 105, 80 and 65 plants/14.5 m²) and some vitamins (vit. B₁, vit. C, vit. E) and active yeast on vegetative growth traits of Ocimum basilicum plants. Results showed that decreasing plant density led to increase number of branches/plant/cut, leaf area/plant/cut, herb fresh and dry weights/plant/cut and yield of herb (fresh and dry) per plant per season, while, plant height was decreased. Moreover, the herb fresh and dry weights/fed were increased with the highest density (145 plants/14.5 m²). All used treatments of vitamins and active yeast significantly increased all previous characters of vegetative growth. Active yeast followed by collection of vitamins (vit. B₁ + vit. C + vit. E) resulted in the highest values in this concern. All vegetative growth characters per plant were the most effective treatments on the lowest plant density × active yeast or vit. B₁ + vit. C + vit. E while, the highest values per fed were obtained with higher density in combination with active yeast or vit. B₁ + vit. C + vit. E.