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Roses are tested in different climate zones of Frances in 7 trial grounds (Annecy, Bordeaux, L'Haÿ-les-Roses, Marseille, Montpellier, Nancy, Rennes) for a period of 2 years for Hybrid Teas, Floribundas, Ground cover roses and Miniatures. and for 3 years for Climbers and Landscape roses.
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Grand Prix de la Rose