Hex #559339 or rgb(85,147,57) in RGB space is the tint of grass green. It has hue angle of 101.33 degrees, value = 58 and saturation = 61. #559339 can be obtained by mixing 4 colors: 4 drops of yellow, 1 drop of red, 5 drops of blue, 5 drops of green.
Nearest safe hex - #669933. Below you can see the block with #559339 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559339 to the mixer and play with it.