Use your fingers or mouse to control scene. Check "Top" for Top view.
Billboard "jungles". To avoid visible walls 2 billboard "jungle" layers (and one backside opaque green wall) are used. Only one rendering call for all flowers second for billboards and one more for 15 instanced textured grass layers.

See also billboard procedural render test and Simple grass.

Lathe flowers 2     updated 26 Aug 2017