This book explores how nature and cutting-edge science converge to create eco-friendly innovations for healthcare, agriculture, food safety, and environmental applications. Aromatic plants, known for their essential oils and bioactive compounds, offer a renewable source for synthesizing nanoparticles through green and sustainable methods, eliminating the need for hazardous chemicals. This book presents a comprehensive overview of how plant-derived nanoparticles are designed, characterized, and applied across multiple industries. Readers will discover their roles in developing antibacterial, antifungal, antiviral, anticancer, and wound-healing agents, as well as their use in cosmetics, pharmaceuticals, and food packaging for enhanced efficacy and safety. The book also highlights agricultural benefits such as nanopriming, biofertilizers, and natural nanopesticides, promoting higher yields and sustainable farming practices. Environmental applications include detoxification of pollutants and heavy metals using plant-based nanomaterials. With contributions from experts across botany, nanotechnology, and biomedical sciences, the book bridges fundamental research and practical applications. It also emphasizes sustainability, regulatory considerations, and future opportunities in this fast-evolving field. A must-read for researchers, industry professionals, and students, this volume offers valuable insights into how aromatic plants are shaping the future of green nanotechnology and driving eco-conscious innovation worldwide.