Plant biotechnology has now become a key tool in improving crop productivity and enhancing commercial value of plant products. The book complies various methods of in vitro propagation and genetic manipulation of important aromatic and medicinal plants. It puts together latest techniques and innovations in the field of plant biotechnology such as effective protocols of genetic manipulation, isolation of secondary metabolites, use of somaclonal variation, stress management in plants. It also explores the role of various physiological and biochemical factors affecting the genetic stability of in-vitro cultured plants. These themes are of interest to both graduate and postgraduate students. Further this book will be useful for to researchers, academicians and industrialist to review latest progress and future prospects of these technologies. .