I planted some Kentucky Bluegrass under a group of trees and it germinated non-uniformly with many patches (each patch is roughly 10 inches in diameter). Can this be caused just by "complete sun" vs "complete shade" differences? I did not use mulch to cover the seed, so one alternative likely explanation is that my watering has washed away much of the seed leaving patches where seed accumulated (even though I tried to be gentle, watering three times a day for a week adds up!).
I was hoping to find some research in which someone plants grass seed under a checkerboard screen of sun and shade (a time lapse video over the first month of this would be great!), but am surprised that I can't find any. What would happen? My feeling is that it will germinate fine everywhere, but then have limited growth (e.g., about 1 inch) in the shade squares.