You may like Witcher 3. Probably the best open world foliage out there today: gorgeous colorful world that feels alive.

https://www.flickr.com/photos/vasiljevich/17906407432/

https://www.flickr.com/photos/vasiljevich/17921228474/

https://www.flickr.com/photos/vasiljevich/17344409903/

https://www.flickr.com/photos/marcelus_sk/17506176714/

https://www.flickr.com/photos/71866538@N04/17890196732/

https://www.flickr.com/photos/100603905@N03/18175649019/

https://www.flickr.com/photos/wakeupmrfreeman/18058537158/

https://www.flickr.com/photos/71866538@N04/18032189865/

http://www.gamersyde.com/hqstream_the_witcher_3_wild_hunt_la...

Screenshots and videos don't do it justice, you have to see it in motion, with sound effects, real-time uncompressed, with things moving in the wind, full of animals, changing daylight and weather.