Well, here’s something I never thought I’d notice.
Even in the most densely-planted colonias of CDMX’s center, the trees can’t grow in peace. On just about every weeping fig, around eye level where the trunk splits off into branches, there will be a used tissue, a plastic cup, a candy wrapper, or a folded prayer (for all I know) placed, wedged, or stuffed into an available crevice. These informal garbage cans are an indication of how few garbage cans there are in the city, and also how unwilling many people are to carry their waste a few extra blocks.
And given that these small places are most certainly not on the average garbage collector’s route or protocol, they are likely to remain where they are.