Hey Adelphia,
Your material seems a bit complex for what you are trying to do. I wrote a tutorial for Two-Sided Foliage material which is simple and can be added to in case you would like to make it more complex.
Two-Sided Foliage Tutorial
You have a lot of multiplying going on which could be what is causing the material to appear white. You will also want to re-check the ‘Tangent Space Normals’ since you are using a tangent normal.
You can keep your wind effect, but try simplifying your material down first and then going back and incrementally adding more complexity to the shader. This way, if you make a change and get an undesired result, you know exactly what change was made.
If you have any questions or need additional help after attempting the suggestions, please let me know.
Cheers,