A little bit of black
It depends on the green you're starting with.
Try adding a touch of brown. Experiment. Small touches of a darker green, brown, black, red, russet, umber, or a darkened burnt orange may change in that direction.
Blue gold
Mixing blue, red, green, and yellow together will create a brown or muddy color due to the combination of complementary colors in the mixture.
The colors blue and yellow combine to make the color green.
dark green and white or yellow and blue
green and gray
white and green
Green and bue
The two colors are blue and green.
Blue and yellow make the color green.
Blue and yellow are mixed to make green.
Brown
The Christmas trees are green.