As many have seen across the transition zone, winterkill greatly affected bermudagrass this spring/summer. With the lack of sprigs and sod available, many are considering seeding Riviera bermudagrass. With that said, in the upper transition zone, the seeding window is beginning to close and will be closed on July 1. Why? Consider reviewing this document from the University of Arkansas and this publication from Purdue University.-from @Jamie Mehringer, Smart Turf blogger