An intensive green roof system is characterized by its variety of vegetation ranging from herbaceous plants to small trees with professional maintenance and advanced green roof irrigation systems. A typical growing medium depth of an intensive green roof is 6 inches or more. Intensive green roofs offer a great potential for design and biodiversity. This system supports everything from small personal/home gardens to full scale public parks. Plant selection and design greatly affects the maintenance required for the upkeep of these roofs. Rooftop farms, urban roof farms or vegetable farms on roofs are clearly intensive green roofs and require higher nutrient applications and focused maintenance.