Since the early 19th century the Blue Grass Region of Kentucky has had a worldwide reputation for its Kentucky bluegrass (Poa pratensis L.) As early as 1835, people from adjoining states visited the region to see its luxuriant fields and to learn of the culture and management of this valuable grass. This interest has led to the development of a profitable seed industry in central Kentucky. Kentucky produced the bulk of Kentucky bluegrass seed for the nation during the latter half of the 19th and the first half of the 20th centuries.
Since 1960, foreign importation and competitive production of seed in the Northwestern region of the United States have resulted in a drastic decline in production of Kentucky bluegrass seed.
Buckner, Robert C., "Kenblue Kentucky Bluegrass" (1968). Agronomy Notes. 189.