Textures too small

I’m trying to texture a large mountainscape but when I put the image on, it becomes very small and the rendered model just becomes grainy instead of textured. I’ve tried using gimp to make the image bigger but it does nothing. How can I fix this?

It sounds like you need to unwrap your model, Its hard to know what your on about without looking at photos of the problem.

Luckily I remember a tutorial that explains a great way to make a mountain range.

https://www.youtube.com/watch?v=3e9f9D0KTcw