Hex #55a339 or rgb(85,163,57) in RGB space is the tint of grass green. It has hue angle of 104.15 degrees, value = 64 and saturation = 65. #55a339 can be obtained by mixing 3 colors: 1 drop of yellow, 1 drop of blue, 1 drop of green.
Nearest safe hex - #669933. Below you can see the block with #55a339 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55a339 to the mixer and play with it.