Hex #559d2b or rgb(85,157,43) in RGB space is the tint of grass green. It has hue angle of 97.89 degrees, value = 62 and saturation = 73. #559d2b can be obtained by mixing 4 colors: 2 drops of yellow, 5 drops of green, 2 drops of white, 3 drops of black.
Nearest safe hex - #669933. Below you can see the block with #559d2b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559d2b to the mixer and play with it.