Cultivars are variations of plants selected for desirable features like flower or leaf color, size, and bloom time.  While the original species is preferable for genetic diversity, many cultivars of native plants or “nativars” are good choices and always better than non-native plants.

Title:   Nativars
Author/Source:   Doug Tallamy
Description:   Audio conversation about native cultivars on a podcast.

Title:   Nativars: What We Know and Recommend
Author/Source:   Cornell Habitat Network
Description:   Practical guidance on the use of native cultivars (nativars) for wildlife gardening, including discussion of how cultivars may or may not support insect populations.