I am new to GrowFX and I must say this tool amaze me. It is indeed a complete tool for foliage creation!
Anyways, I looked up the website and the forum for an explination on how to use vertex color for leaf variation, but couldn't find what I needed.
There are really beautiful renders by 3DMK for a tree with and without the use of vertex color, I tried to acheive a similar result but seems like I am missing something regarding VC and couldn't get to set it up right to create variation.
Any advice or suggestion would be really appreciated!