// You could place these scripts anywhere in your init.sqf and replace "player" with a world position or the variable name of another object the number 50/200 is the area which will be effected
// Copay and paste these examples in your debug console to see what they do in the editor.

// Remove just trees and bushes:
{
    _x hideObjectGlobal true;
} foreach  (nearestTerrainObjects [player,["tree","bush"],50]);

// Remove everything:
{
    _x hideObjectGlobal true;
} forEach   (
                (nearestTerrainObjects [player,[],200]) +
                (nearestObjects [player, [], 200])
            );