MORGAN IS MONTHS BEHIND RICK
In the final post-credits scene (fun fact, this wasn’t shown at the premiere in order to keep it secret) we see Morgan, seemingly following Rick and his crew. Notice the sign when Rick marks it vs when Morgan shows up:
People are saying that the extreme growth when Morgan arrives indicates that he is MONTHS behind Rick. There is some credence to this. Multiple producers have pointed out the growth on the sign but I take that to mean that Morgan is a few weeks behind at most, not months and months behind. A) There is already some growth when Rick leaves, and B) vines can grow pretty fast. It isn’t like the seasons have changed. I think the crew was more worried about showing that Morgan wasn’t RIGHT behind them then they were trying to show how much time has passed.