A cultivar's a cultivated plant that's been selected and given a unique name because of its decorative or useful characteristics ; it's usually distinct from similar plants and when propagated it retains those characteristics. The naming of a cultivar should conform to the International Code of Nomenclature for Cultivated Plants (the ICNCP, commonly known as the Cultivated Plant Code). For this, it must be distinct from other cultivars and it must be possible to propagate it reliably, in the ma… (More on Cultivars)