The bluegrass region is characterized by a limestone shale geologic base that tends to provide a basic soil pH. It also contains the Kentucky River palisades. The original bluegrass ecology was open woodland savanna characterized by a grassland understory and giant individual trees including Kentucky coffeetree, black walnut, bur oak, and blue ash. Although most of the wooded savanna is gone, numerous large trees still dominate old estates and pastures in the bluegrass.

Bluegrass region