My trees are too dark in unity.

Hello, I have searched forever on the forum and am unable to find an answer to my problem. I am using terrain trees. I have imported the trees from a package on the asset store called NatureStarterKitV2. I have a custom material on my terrain. The only thing about this custom material is changing the shader to the terrain diffuse one. I tried switching from forward to differed rendering. I tried changing the shader on my terrain and adding some ambient intensity all with no luck. I have included a screen cap of the problem below.