The ability of the cool season turfgrasses, Kentucky bluegrass (Poa pratensis L.) and perennial ryegrass (Lolium perenne L.) to form a seedbank under intense traffic scenarios is not well understood. The practice of establishing a seedbank on athletic fields has been often recommended in popular venues, but has received little attention in academic research. Likewise, anecdotal reporting of seed unexpectedly germinating long after planting are common but have not been scientifically tested.