It can be so frustrating when yellows seep into the greenery of an image. Luckily it's pretty easy to fix!
This problem used to drive me crazy. I couldn't figure out how others were getting their greens to be true to color. What I realized is that they were doing this in post processing, not in camera! I'll rarely advocate for the mentality of "I'll just fix that later when I'm editing," but this is the exception!
I had spent so many hours trying to figure out how to do this that it almost seemed anticlimactic when I figured out how to do it! Here's a quick video highlighting how I get greener greens using Adobe Lightroom.