This is one of the reasons I love this forum! All these funny, creative ideas people get. Guerrilla gardening! The name itself gives me a grin.
I´ve never heard about it until now, but I love the idea. I hope you are successful and wish you all the best of luck!
We never thought to ask, but what would you plant where you are living now ? Do things like our little wild strawberries and ransoms thrive there too ?