Is there a way to make color grading for leaves?

If there is no way to do this, then how can I make a gradient of vertex colors?
I only achieved this result:

Doesn't look like a linear gradient...
P.S. Also how do i export only billboards without other textures?
If there is no way to do this, then how can I make a gradient of vertex colors?
I only achieved this result:
Doesn't look like a linear gradient...
P.S. Also how do i export only billboards without other textures?
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