By now, everybody knows all about THC, the most prominent and psychoactive chemical compound found in the marijuana plant, first isolated by Dr. Raphael Mechoulam in 1964. In fact, for decades, everyone from doctors and scientists to medical marijuana patients and even everyday stoners generally accepted the notion that delta-9-tetrahydrocannabinol == THC’s formal name == was the active ingredient in cannabis, providing not just the plant’s legendary high, but also its myriad medical benefits. The latest research shows, however, that this myopic focus has done us all a great disservice.

Studies now prove that another cannabinoid (the name for compounds found only in the cannabis plant) known as cannabidiol, or CBD, shows tremendous promise in treating pain, insomnia, nausea, anxiety, multiple sclerosis, Alzheimer’s disease and cancer.

Unfortunately, CBD also tends to temper the high created by THC, so over the years, those of us seeking increasingly stony strains have been unwittingly breeding CBD out of the cannabis gene pool, to the point where most modern strains contain far less than 0.5 percent.

But now, thanks in large part to the pioneering work of Project CBD (projectcbd.org), truly compassionate breeders have been working to identify and develop a wide variety of CBD-rich strains.

One of their most important discoveries, Sour Tsunami, was developed by Lawrence Ringo of the Southern Humboldt Seed Collective. The high-CBD version of this strain remains a phenotype, with each seed offering a 25% chance of containing 10% to 11% CBD (and 6% to 7% THC).

Ringo bred the Sour Tsunami by crossing NYC Diesel to Sour Diesel for about four years, constantly crossing it back to a Sour Diesel clone. Then he crossed the results, which he dubbed Double Diesel, to a local, sativa-dominant strain called Ferrari, and then recrossed that back to Sour Diesel to produce the Sour Tsunami, which is 60% sativa and matures after nine weeks into musky buds with sweet undertones.