This growing guide is intended to inform about the method of growing watermelon (Citrullus lanatus) extensive. Watermelon (Citrullus lanatus) is a major cucurbit crop that accounts for 9% of the world area devoted to vegetable production. Andalusia is the region leading both cultivated area and production. This document provides a botanical description of the plant, planting technique, crop requirements and management, crop pests and diseases, as well as the main varieties and types of watermelons. Finally, production costs are presented taking into account the irrigation system used.