One of the most popular alternatives to green is purple—think Granddaddy Purple. Purple pigments occur fairly easily in the cannabis plant, as it begins to lose chlorophyll as it matures into old age. However, before the bud gets too old, purple pigmentation can also be engineered in neutral pH environments.
Reddish strains are harder to come by, but can be bred by manipulating nutrients and depriving the plant of phosphorus. The darker, even black appearing strains, are caused by an excess of pigmentation in the cannabis’ leaves. These strains are also known for more intense visuals and psychedelic highs. They usually thrive in somewhat cooler temperatures, since in warmer environments the dark, deep reds and purples may become lighter.