Hex #408620 or rgb(64,134,32) in RGB space is the tint of grass green. It has hue angle of 101.18 degrees, value = 53 and saturation = 76. #408620 can be obtained by mixing 4 colors: 2 drops of yellow, 1 drop of cyan, 2 drops of green, 3 drops of black.
Nearest safe hex - #339933. Below you can see the block with #408620 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #408620 to the mixer and play with it.