u need to edit the ini files
check http://www.gamesas.com/index.php?/topic/1274926-ugridstoload-skyrimini-comparisons-and-explanation-default-57911/
my ini file grass settings
[Grass]
b30GrassVS=1
fGrassStartFadeDistance=25000.0000
fGrassMaxStartFadeDistance=25000.0000
fGrassMinStartFadeDistance=0.0000
Nah its not those settings, i just increased mine and it doesnt affect shrubbery.
here's a video for an example, watch the shrubs on the right hand of the screen pop in and out http://youtu.be/YwOLVSMKQHw