Is There A Way To Disable The Grass Details While Keeping The Game Looking Like Late Autumn?

i want to make my game look like late autumn without any grass and leaves, how can i do that? because i'm kinda confused on how can i do that and i wonder if i can turn off the grass details, any help is appreciated

 

When you set a scenario there is a season setting - change that to Autumn.
It would then depend if the route has Autumn Colours and separate grass for it

 

i mean, to make the trees look like without leaves

 

So not grass but Trees.
Trees usually have a winter texture, without Leaves, but I don't think they have a Autumn texture

Have a look at this
https://www.armstrongpowerhouse.com/enhancements/general/vegetation_enhancement_pack
There is a link to the manual part the way down the page