The r_drawfoliage setting toggles drawing the foliage or not.
/seta r_drawfoliage 1
Values: “0” or “1”
For example it can show all the grass on stock Radar map.
It changes your fps, it might worth setting it off (0), BUT in this case it will says: “r_drawfoliage is cheat protected”. So I guess when it is disabled by server side, you can’t use it.