Hex #558044 or rgb(85,128,68) in RGB space is the tint of grass green. It has hue angle of 103.00 degrees, value = 50 and saturation = 47. #558044 can be obtained by mixing 4 colors: 1 drop of red, 5 drops of green, 4 drops of white, 5 drops of black.
Nearest safe hex - #669933. Below you can see the block with #558044 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #558044 to the mixer and play with it.