Original video: https://youtu.be/3mblOhwxerU Lecture on: 10 November 2025 This lecture, part of the Crop Physiology (AGR3301) course, provides a comprehensive overview of Plant Growth Regulators (PGRs), also known as Phytohormones. These are natural chemical messengers that control a plant's growth, development, and movement at minute concentrations. Keywords: Phytohormones, Plant Growth Regulators, Auxin, Gibberellin, Cytokinin, Abscisic Acid, Ethylene, Plant Hormones, Apic