European flint maize has proven to be an outstanding partner of North American dent maize for developing hybrids in Northern Europe. Use of publicly available genetic material in genetic studies is nevertheless complicated by a number of agronomic defaults, especially root and stalk lodging, tillering and a number of disease susceptibilities. A first series of lines available at INRA (Camus-Kulandaivelu et al. 2006, Genetics), was increased within the CornFed project, which involved German, Spanish and French partners, leading to 300 diverse lines. These lead to the discovery of QTL for biomass production (Rincent et al., 2014, Theor Appl Genet) and cold tolerance (Revilla et al., 2016, BMC plant Biology). To further increase this panel, Gouesnard et al. (2017, Theor appl Genet) conducted a GBS based survey of all flint type materials present in the INRA collection. Original lines not introgressed by dent germplasm were selected to complete the collection. They were also intercrossed to produce new recombinant materials between different genetic origins. This lead to a total of 1200 preexisting and new lines that were evaluated per se in a windy environment in Brittany to favor lodging, which revealed a high genetic variability. Association genetics will be conducted in the coming months. Finally, out of these lines, 350 lines selected within a narrow phenology range and showing limited lodging susceptibility have been crossed to a dent tester to conduct agronomic trials for adaptive traits, to be started in 2019.