The purple aroma is from a mix Gas genetics crossed with high elevation pine and fruit genetics. A majority of Purple genetics come specifically from Mendocino purps, such as, Grand Daddy Purple, Grape Ape, Purple Erkle, Cherry Pie and several others. These have created most of the well know purple genetics on the market today. In general high elevation causes the purple color in leaves and comes from pigments called anthocyanins. These pigments also give many red- and purple-colored fruits and flowers their color, as well as tree species that turn a reddish color in autumn. Coincidently this purple hue create a grape like smell and aroma. These were originally Indica dominant hybrids. (70/30)