1. Introduction to natural biostimulants 2. Mode of application of biostimulants 3. Role of natural biostimulants in seed germination 4. Influence of biostimulants on pollen tube development 5. Role of biostimulants in pollen-pistil interaction 6. Biostimulants for flower and fruit set 7. Enhancing plant pigments using natural biostimulants 8. Biostimulants and development of shoot and root 9. Effect of biostimulants on rhizospheric and soil microorganisms 10. Effect of biostimulants on antioxidant properties of plants 11. Biostimulants in enhancing nutrition efficiency of crops 12. Cellular and metabolic effects of natural biostimulants 13. Biostimulants in improving yield and shelf-life of crops 14. Contribution of biostimulants in improving soil health 15. Role of biostimulants in the regulation of phytohormone biosynthesis in plants 16. Disease management using biostimulants 17. Role of biostimulants in mitigating biotic and abiotic stress 18. The biochemical, physiological and molecular mode of action of biostimulants 19. Commercial natural biostimulants and their role in plant growth development 20. The current and future directions in biostimulant research