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This study investigated the establishment of annual meadow including native and non-native species in an extensive green roof in Sheffield, UK. The study aimed to determine the feasibility of establishing annual plant species from a seed mixture and to determine the appropriate sowing rate as well as the necessity of watering during the first growing season from June to November 2006. A 22-species seed mixture was sown on an experimental green roof with a substrate depth of 7cm using two sowing rates (2g/m² and 4g/m²) and two watering regimes (with and without watering). The watering regime consisted of application of water four times over the course of the experiment. Each combination of sowing and watering regime yielded a successful aesthetic annual meadow green roof. Results showed that a low sowing rate resulted in better conditions for individual plant growth when enough water was available …