Trees further away from the camera are not rendering properly. need help..

I have placed a few trees on the terrain. All trees render nicely when close to the camera but as soon as the camera goes further away, they appear to be just flat black models. It happens in the scene view as well as in game view.
Please guide me if I’m missing some setting or something? if it has to do with performance, then also elaborate that.

Try changing the Near and Far values on the Main Camera.

Near is The closest point relative to the camera that drawing will occur.
Far is The furthest point relative to the camera that drawing will occur.

0.3 Unity Units in Near
and 1000 Unity Units in Far.

https://forum.unity.com/threads/camera-clipping-planes-near-and-far-meaning.335597/