I've been saying this for a while
Guerrilla gardening has its place and that place is in empty, neglected areas that receive no attention apart from getting mowed or weed-whacked every month or two.
The idea is this: when your area was developed and buildings and roads were constructed, many plant species were extirpated from that area, and most plant species are becoming more and more isolated with populations in increasingly scattered locations
You are re-introducing plants into areas that either are suitable habitat, or where you could feasibly care for them
Guerrilla gardening appeals to the part of your brain that wants to stick it to The Man and do something exciting and risky and cool and "punk"
And I think that part of your brain can be ultimately self-serving.
Because many of the most effective actions you can do don't FEEL badass and subversive. They don't LOOK badass and subversive. Direct action is often boring as fuck and not illegal and won't be recognized as courageous and cool because it's very mundane and often tedious and sometimes gruelingly hard.
Two or three friendly conversations with your neighbors about native plants are worth a thousand seed bombs
This type of popular image of "direct action" glorifies and lionizes this idea of an individual person doing something Cool and Illegal, and for the most part, this is a fantasy and a lie and a product of the terribly anti-human, anti-community, hyper-individualistic type of society we are in
Do you want to make your neighborhood into a lush paradise for native species? Talk to your neighbors. Do you want X institution to stop using pesticides on their grass and start a pollinator garden? Call them. Email them. Now find other people in your area who can support you and try again. See if your library can tell you about local environmental organizations. Reach out to the guy who runs the farmer's market or the lady who is in charge of the gardening club. Build up a list of contacts.
Do you know how you can get people to grow native plants? Do you know the number one super easy way to get people around you into growing native plants?
Grow native plants yourself, and when they spread or produce seeds, offer everyone free plants.
I cannot possibly recommend this method enough.
If you would throw seeds into someone's front yard instead of knocking on their door and asking, "Hello, do you want some seeds?" ask yourself why. Because the second thing has a much higher chance of actually having good results.