How about Hairfarm - it is an extraordinary plugin used by many many studios to do all kinds of scattering, hair, grass, fur, leaves, and has great support for animation.
PS: I don't belong to the company, I just used it extensively for the 4D Spongebob interactive adventure videos and I was really surprised at the flexibility of the product. Would love to see a Corona geometry generator akin to VrayHairfarmMod for this plugin ;)