Welcome aboard.
The grass may not be a problem -
fsx grass texture.
Give those a try, but for various reasons you may just want to learn to live with it.
As to shrubbery, that might be a bit harder because unless
you put shrubbery in the scenery, you may have to live with what shrubbery "THEY" have placed there.
But if the trees & shrubbery
IS there you do have another solution -
Orbx/FTX Trees HD. Read
this and
this link, or better yet, look it up on the internet.
Good luck.