BerniceC: In the UK a few years ago there used to be a wild bird food on the market called 'Swoop'. It was made up of all kinds of seeds.
Occassionally some would inevitably spill onto the garden - and some of them would actually grow.
Certain seeds had to be removed from boxes after a while when certain (shall we say 'exotic'?) plants started sprouting in the gardens of sweet little old ladies.
Well, hey, man! Groovy!