This document discusses the rules and methods for collecting medicinal herbs and plants according to Ayurvedic texts such as Charaka, Susrutha, and Rajanighantu. It outlines the optimal periods for collecting different parts of plants, such as roots in winter, leaves in spring, flowers and fruits seasonally. The texts provide guidance on collecting tender parts when plants are growing and mature parts when plants have shed leaves. They also specify collecting purgative and emetic herbs at the end of spring. The module covers rules for collection, periods of collection, and places of collection of medicinal herbs and plants.