trees and grass appear as i walk?!

The problem is even the vegetation right before my feet is appearing as i move forward?! is there some way to adjust it so at least everything with in i certain distance is visible? I don’t know what this is called?

what am i looking for to fix this problem?

I believe it is in the terrain properties. You need to adjust your view distance. I’m at work right now; so, I cannot confirm the exact location of this.

just use textures for your grass details that are a power of two !!! (128128 / 256256 /512*512/ etc… And all your problems will vanish !!