The present book discusses the clean and non-toxic synthesis of gold and silver nanoparticles exploiting the potential weed plant. The synthesis is followed by evaluation of their antibacterial and antifungal properties. Additionally, these synthesized particles are also tested on viral particles, which gave promising results and can open new avenues for looking of antiviral compounds. This book abundantly uses images of various stages along with detailed protocols and compositions of all the reagents. This book will open new outlooks for green synthesis of nanoparticles using plant extracts...