Hex #559a47 or rgb(85,154,71) in RGB space is the tint of grass green. It has hue angle of 109.88 degrees, value = 60 and saturation = 54. #559a47 can be obtained by mixing 3 colors: 4 drops of yellow, 5 drops of blue, 3 drops of green.
Nearest safe hex - #669933. Below you can see the block with #559a47 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559a47 to the mixer and play with it.