This is how I mix greens. Let me know if you have any questions.
If you'd like to learn a systematic way of mixing colours then Colour Mixing with Confidence may just be the course for you. During the course you will create the charts that I refer to in this video. Using 11 different commercially available oil paints, I'll show you how to unlock your palette, build your confidence, and know how to mix any colour you might need for your paintings.