George Diggs, who is an evolutionary biologist and professor of botany, will present “The Blackland Prairie Across Time” to members and guests of the Collin County Chapter of the Native Plant Society of Texas. He will discuss what and where the blackland prairie is, how it came to be, the nature of its soils, and the relationships of peoples past, present and future to the blackland prairie. Visit the NPSOT chapter page for information about how to access the online meeting. N.B., the virtual doors open at 6:30 p.m., a brief business meeting will start at 7 p.m., and the presentation should begin at about 7:15 p.m.