Hex #408120 or rgb(64,129,32) in RGB space is the tint of grass green. It has hue angle of 100.21 degrees, value = 51 and saturation = 75. #408120 can be obtained by mixing 4 colors: 1 drop of yellow, 3 drops of green, 1 drop of white, 3 drops of black.
Nearest safe hex - #339933. Below you can see the block with #408120 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #408120 to the mixer and play with it.