These people in LA are planting in public spaces with permission from property owners and creating beautiful oases through public areas.
https://www.kcet.org/shows/broken-bread/how-to-be-a-guerrilla-gardener
My kind of fun. I love planting too. This seems like a great way to provide for homeless as well. It is relatively efficient considering there is not much government involvement. Hopefully this project will continue and grow and help many people to come.