What money tree?

I like words, use them a lot and am one of those people who has books full of them. When I was small, I wanted everything and was constantly told that money doesn't grow on trees. Now I am not small and I still want everything. I sometimes wonder why I was told that money doesn't grow on trees. I never for one moment thought that it did. I always thought money grew in banks and I'm sure you have your own opinion on that!