As a master grower, your job is to manage a greenhouse or other plant-growing facility. This job often involves breeding new types of plants, checking each existing plant for diseases and other problems, and generally supporting the facility's production. Master growers usually focus on products for a specific industry, such as home horticulture or agriculture. In recent years, master growers have also taken on the responsibility of growing cannabis in states that allow the legal use of marijuana. Some details of this job vary by company. For example, master growers working in the food industry need to meet certain product safety standards, while master growers that focus on producing seeds for farmers usually emphasize product volume.