An important distinction in natural gardening is between native plants and non-native plants. A native plant is one that has evolved in the region where it is planted, and which typically has developed important relationships with other plants and animals in that region. A non-native plant is one that is planted far from where it evolved. It often contributes little or nothing to the local community, because the animals in its new home cannot eat it, or may not recognize it as a potential food source.
A cultivar is a type of plant that didn’t evolve anywhere. Rather, a cultivar is the plant equivalent of a domestic animal. The same way that modern cows never existed in the wild and are the result of careful breeding, cultivars have been bred from wild plants to bring out desirable characteristics.
The characteristics that are desirable to people, however, are often of no value to wildlife. Double-flowered cultivars, for example, are considered especially attractive in a garden. These flowers are worthless to pollinators, though, because they are mutant plants that have a second row of petals instead of having the structures that produce pollen and nectar.
Nativars are cultivars of native plants. Well-meaning gardeners seeking to support wildlife are often tripped up by nativars, which are advertised as native plants, but which can be as useless to pollinators and other animals as cultivars of non-native species.
Cultivars and nativars can be recognized by the names on their tags. Plants should always be labeled by their scientific names, which help gardeners ensure they’re getting the right species. A plant that has a second, English name in quotes after its Latin name is a cultivar or nativar, not a true species.