Sustainability in the floricultural value chain comprises a multitude of aspects, such as the economical use of resources, mainly energy, water, nutrients, and substrate ingredients such as peat, as well as the avoidance of environmental pollution by plastic wastes, fertilizers and pesticides. Several of these aspects can be addressed in breeding programs using conventional techniques, such as classical cross breeding and selection, polyploidization and interspecific hybridization, ideally supported by marker-assisted selection. This chapter summarizes the advance in these breeding techniques in ornamental crops and discusses their application with respect to breeding goals covering aspects of sustainable ornamental plant production: drought tolerance, low temperature tolerance, elevated pH tolerance, resistance and tolerance to biotic stress, nutrient use efficiency, compactness and postharvest life. In the future, breeding will become more efficient once the genetic base of the novel – mostly very complex – traits is resolved. Thus, research efforts are needed in both model and ornamental plants.