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Miscanthus sinensis, M. sacchariflorus and their hybrids have been identified as leading candidates for the provision of bioenergy production across several continents. Flowering time is an important trait affecting biomass yield as well as certain quality attributes, such as moisture content at harvest. The aim of this study was to ascertain the level of diversity available to breeders and potential for hybridisation of different accessions in a large collection of Miscanthus. We also sought to determine trends in flowering time within and between species with respect to environment and origin of collection data (where known), whether flowering order was maintained across years, and the extent of uniformity of flowering in different genotypes. Flowering time was observed weekly in 244 genotypes of two Miscanthus species (M. sinensis, M. sacchariflorus) and inter‐specific hybrids including M. x giganteus over 3 years and …