This book covers the topic of biostimulation of crops using nanomaterials to increase crop production and quality improvement, accompanied by the reduction of environmental impact in the form of less use of pesticides and greater efficiency in the use of fertilizers and water. Different classes of biostimulants have been recognized and studied, but nanomaterials are among the most recently considered with a dual category of biostimulation-inducing physical and chemical agents. The physical process of biostimulation occurs through interactions at the interfaces of the nanomaterial corona and cell walls and membranes. In contrast, the chemical process depends on the corona and core composition. The chapters in this book present the different topics of biostimulation with nanomaterials with the consideration of different spheres of organization, from the molecular view to agricultural ecosystems. It looks at the interactions between nanomaterials and plant cells that differ depending on the corona's size, shape, specific surface, and composition, in addition to the dynamic biological contexts of development and interaction with other environmental factors. The book caters to researchers and scientists who are interested in the biostimulation of crops using nanomaterials and their long-term ecological impact.