ivy generator может спасёт?
http://www.ronenbekerman.com/scattering-on-vertical-surfaces-with-forest-pack-pro/
Странно-странно http://3ddd.ru/search?query=%D1%84%D0%B8%D1%82%D0%BE%D1%81%D1%82%D0%B5%D0%BD%D0%B0& ;sp_model=on
plant factory
http://www.plantfactory-tech.com