CVar groundEffectDist

Set the maximum distance from the player at which to render ground effects such as ferns, flowers, grass, and rocks.

Default Setting

 * 32

Possible Settings

 * 32 :min setting
 * 40 :default setting
 * 600 :max setting

Changing this setting
In-game, type the following

/console groundEffectDist setting

Alternatively, you can exit WoW, open the Config.wtf file, and add the following line:

SET groundEffectDist setting