Hex #55ad2b or rgb(85,173,43) in RGB space is the tint of grass green. It has hue angle of 100.62 degrees, value = 68 and saturation = 75. #55ad2b can be obtained by mixing 4 colors: 1 drop of yellow, 3 drops of green, 1 drop of white, 1 drop of black.
Nearest safe hex - #669933. Below you can see the block with #55ad2b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55ad2b to the mixer and play with it.