I'd like to see you mess with vertex blending using a texture on the grass to rock transitions, I also thing you should edit the vertex normals on the purple plants so they light better, you probably could just point the vertexes straight up. I'm also not a huge fan of the water at the current state, but Dan!'s corrections…
This post is also on the UDK Forum here, I just REALLY need this fixed :/ I have a material that I want to go on a trench-like mesh. I need it to blend between the surface/wall textures and can do this using a Constant3Vector Dotted with a Transformed Vector, and use this as the alpha of a lerp node to blend between the…