All the advice from Jean-François Lyphout to make and use purines and other plant extracts for a naturally fit garden. Purines and other decoctions are biostimulants that primarily strengthen and stimulate the defenses of plants, with indirect effects on diseases or insects. Nettle purines and plant extracts are alternatives to pesticides that have undeniable results. In this book you will discover: - The main useful plants and their properties (nettle, comfrey, horsetail, fern, garlic, etc.). - How to make a good purine - Other types of extracts (decoction, infusion, maceration) - How to use them well in the garden and vegetable garden, on terraces, or balconies in the city. In addition: 11 practical videos accessible with a smartphone or tablet.