Hi! I’m Mark, and I’ve been running into a little issue lately.
Basically, I’m trying to create a plain for my game. The grass option that they let you choose is really cool, but there’s no grass in the desert, so I’m trying to make it sort of a beige grass color, for instance, in this picture:
Help would be really appreciated! God bless 
Have you tried changing the grass material itself to be beige? Go to Explorer > Click on the terrain > In properties switch the terrain color to be a beige color using the color picker.
https://blog.roblox.com/2017/12/customize-color-terrain-materials/
Basically what I said above ^^
If you wanted a green grass “base” color and the realistic grass to be beige, that isn’t currently a feature.
Hope this helped.
It works, thank you so much! I can’t believe I overlooked that haha