Plant growth regulation refers to the intrinsic and extrinsic mechanisms that control the development, growth, and physiological processes of plants. This complex biological system involves phytohormones, environmental cues, and genetic factors that orchestrate cellular division, differentiation, and expansion, ultimately determining plant architecture, reproduction, and stress responses. While not a disease, dysregulation of these processes can lead to abnormal plant development, which may be mistaken for or contribute to plant pathologies.