Hex #448739 or rgb(68,135,57) in RGB space is the tint of grass green. It has hue angle of 111.54 degrees, value = 53 and saturation = 58. #448739 can be obtained by mixing 4 colors: 4 drops of yellow, 5 drops of blue, 4 drops of green, 2 drops of black.
Nearest safe hex - #339933. Below you can see the block with #448739 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #448739 to the mixer and play with it.