About 15 years ago my kid was given a picture book called The Curious Garden about a little boy who practices guerilla gardening in NYC which eventually grows (via community action) into to the High Line Garden.
Ever since then I’ve tried to keep packets of native wildflowers on me. There are a lot of semi-overgrown and underutilized areas where I live, and I can think of a few spots now that have regular outbreaks of wildflowers because I happened to be passing by one day.