Hybridisation with and introgression from wild species is morecommon in garden rose breeding than it is in cut rose breeding.Specific traits, such as winter hardiness, are introduced from wildrelatives (R. rugosa, R. arkansana, etc.). Each breeder uses a sourcefor a trait of interest from wild species or cultivars with the pre-ferred trait. In general, breeders are specialised for one or a fewrose types and want to be recognisable by their cultivars so theyuse a set of germplasm that is different from other breeders. As aconsequence it is possible to distinguish breeders on the basis of cultivar phenotype (e.g., Paulsen, Harkness, Austin, and Noack). Atthe same time, the sources for other traits, such as winter hardi-ness, thornlessness, recurrent blooming, and patio growth type arelimited, so breeders may use the same or similar germplasm andgene donors.