"plants can't be over 12-inches tall unless they're used for human consumption"
What? I can understand (to a certain extent) a city wanting to keep a neat and orderly appearance throughout residential neighborhoods. But with a limitation like that, you can say good bye to roses, carnations, and practically every flower bed in the city!
A spiteful person could kill their
lawn and lay astroturf as a means of beautifying the city!
Or better yet, a bright orange
concrete slab! 16 coats of paint that glow in the dark!
Sounds stupid? Sure it does, but how else do you fight stupidity?
EDITED to add: Given my nature, if that had happened to me, I would probably have taken my weed-whacker to the city parks, and made certain that they complied with the 12" rule.