The blend is made up of approximately 15 crus, including Chatillon sur Marne, Venteuil, Fleury la Riviere de la Rive droite de la Vallee de la Marne, Vallée de l’Ardre, Cote des Bars and Coteaux de Sezanne. The vineyards are situated on the renowned, chalky soils of the Champagne region. Champagne Duval-Leroy was one of the first Champagne houses to be HVE3 certified, and many sustainable practices were employed. Measures are taken to combat the run-off of rainwater, to limit the pollution of underground and superficial water; grass cover crops are grown, and processes to combat soil erosion are employed. Biodiversity is positively encouraged, sustainable fertilisers are used, and sexual confusion of predators takes place instead of insecticides. The plots and weather conditions are carefully monitored, with soil testing and cartographic, computerised methods in place for full traceability of products used in the plots. Above all, preventative measures are in place to minimise the use of products, which, if necessary, are carefully chosen to have the least impact on the environment.