Lawrence Ringo: The Father of CBD

By Sharon Letts
Published: February 24, 2021 | Last updated: May 12, 2022 11:03:46
Key Takeaways

The man behind the famous Charlotte’s Web strain is Lawrence Ringo, who introduced the world to high-CBD cannabis strains. Read on to find out why he was a such a legend and pioneer in advocating for and breeding medical marijuana.

Charlotte’s Web, the cultivar high in cannabidiol (CBD), was first introduced to the world via a television documentary; what the world didn’t know is that the cultivar actually began in Southern Humboldt in Northern California.


When CNN aired Dr. Sanjay Gupta’s first documentary Weed in 2013, Charlotte’s Web seemed like a miracle plant, with little to no psychoactive properties and lots of healing.

The cultivar was named after then four-year-old Charlotte Figi, who suffers from Dravet Syndrome, and was enduring up to 300 grand mal seizures per week at the time. Figi benefited greatly from oil derived from the cultivar and her story was told on national television via Gupta’s documentary. Sadly, Figi died April 7, 2019. She was 13.


Due to the legalities of prohibition, the story of the cultivar’s lineage was left untold. As Charlotte’s Web came from a combination of seeds and starts purchased from the Southern Humboldt Seed Collective after being painstakingly hybridized by Lawrence Ringo.

Another little-known fact is that a group of some 40 children with seizures were already being helped in Northern California with Ringo’s CBD cultivars, long before Figi’s story made headlines. Due to the covert nature of the region, combined with a fear of Child Protective Services, the story was kept under wraps.

Historic Horticulture

Historically speaking, it was the cannabis farmers in northern California who first focused on hybridizing the psychoactive properties of the plant. Lawrence Ringo — who had been growing weed since he was 15 and then farmed in Southern Humboldt for 35 years — hybridized the tetrahydrocannabinol (THC) back down on some of his plants, while raising the CBD compounds to new heights.


As with many medicine makers who dabble in cannabis remedies, his intent was personal. He’d suffered from severe back pain since childhood. Missing a disk between his third and fourth vertebrae, his bone-on-bone pain required something more than the pharmaceuticals could offer.

His widow, Kat Hart, says he also developed the cultivars to enhance his guitar playing — demonstrating the versatility of the plant as a crossover from recreational to medicinal in one strum, so to speak.


Read also: Top Five Strains High in CBD

As if Ringo’s history in weed isn’t colorful enough, he was taught to grow cannabis by the head of a neighborhood Hell’s Angels, after finding and returning a snub-nosed .38, a sapphire gold ring, and a film can full of cocaine. He threw the cocaine away, returned the ring and gun, and noted the rather large sativa plant in the man’s yard. When the man asked what he wanted for returning the items, he quickly replied he wanted to learn how to grow weed.

It took him years to develop the cultivars that would help his own back pain, while enabling him to maintain productivity throughout the day. His goal was not to get as high as possible, but rather, to be as pain-free as possible. He saved the seeds of the plants that offered the most relief, and eventually hybridized them to get the strains we are familiar with today.

For instance, the plants grown from New York City Diesel seeds, purchased from Canadian Marc Emery, were crossed with Sour Tsunami starts to get the Sour Diesel we know today. The irony of the lineage of Charlotte’s Web continues, as Emery would spend time in prison for selling seeds across borders.

Ringo relied solely on the cultivars he developed to control his pain. In an O’Shaughnessy’s Journal article published in 2011, Ringo stated, “I’ve been to every doctor and chiropractor. No one can really help. When my back really hurts I do the high-CBD kief. Two pipe loads and I can go out and do anything — ride a motorcycle, work in the garden.”

Lawrence Ringo in a field of weedRingo was taught to grow cannabis by the head of a neighborhood Hell’s Angels.

From Farmer to Innovator

Though Ringo is known for his hybrids, he’s also known for using light deprivation (a technique commonly used today) starting in 1980 by tricking plants into thinking it’s time to flower.

According to Ringo’s bio, found on, Ringo used the technique by covering his greenhouse, blocking out all sunlight.

This encouraged early sexing, enabled females to be planted in early May, and ensured that large plants would harvest earlier. This ensures fresh medicine through the summer months when there is typically a void of plant material until a fall harvest. Because the CBD cultivars are not trimmed, allowing for whole plant compounds, there is no excess.

On his 40 acres in Blocksburg, CA., Ringo honed his skills as a farmer and breeder. He worked with landrace cultivars from around the world, including Mexico, Thailand, and Afghanistan. These are the strains that helped to create the high-THC strains found in today’s cannabis market.

Ringo left Humboldt County for Santa Cruz to raise his boys, but ended up back in Blocksburg, purchasing seeds from Emery’s Seed Company. With eight initial cultivars, Ringo developed 20 new ones, starting Kush Seeds, then the Southern Humboldt Seed Collective (or SoHum Seeds).

Read also: Treating Epilepsy with CBD-A from Live Leaves

Everyone cheered on the day Samantha Miller of Pure Analytics, a California lab, called to let the team know his Sour Tsunami measured in upwards of 11.3 per cent CBD, while retaining six-to-seven percent THC.

This was the first time Miller had encountered high-CBD cultivars and the findings were not lost on her. The bigger news was Miller advised Ringo had eight other cultivars that also had the potential of testing high in CBD.

“At that point we knew very little about CBD, but Samantha conveyed its importance,” Hart shared. “It was really the defining moment for So Hum Seeds as we know it now.”

As Hart explains, Sour Tsunami was the first cultivar to test dominant for CBD, then came Harle-Tsu, Canna-Tsu, and Swiss-Tsu.

Current cultivars available in its catalog include AC/DC (bread by Dr. William Courtney), Canna Tsu, Cheesel O, Harle Tsu, Hula Budda, Kona, Pineapple Tsunami, Purple Diesel, Sour Tsunami, Swiss Tsu, and OG Cheese Dog.

Ringo’s Harle Tsu is an excellent example as it stands alone in the Phylos Galaxy with a 20:1 ratio of CBD testing upwards of 22 per cent CBD.

Sour Tsunami Sour Tsunami was the first cultivar to test dominant for CBD.

Breaking Down the Plant

Ironically, legalization in Colorado allowed the Figi story to be told, which has helped change public perception of the plant altogether.

Hart says it stung when a version of Ringo’s CBD cultivar took center stage in the CNN documentary, laughingly referred to as a “hippie’s disappointment,” for lack of THC. Its Humboldt lineage went unmentioned due to the legalities of crossing state lines with the seeds and starts.

Records provided by Hart reveal that Charlotte’s Web’s ancestry may stem from a combination of Harlequin and Sour Tsunami, but Hart says the profiling shows a grab bag of varieties, albeit, with Ringo’s strains predominantly in the mix.

Phylos Bioscience genetically tested Charlotte’s Web and it does show a connection, but it also shows that we were not the first to work with high-CBD strains,” Hart shared.

What Phylos discovered is that while Ringo was honing his CBD in Southern Humboldt, breeders in Spain were working on the same exact process. If the universe really is aligned, then cannabis was a conduit in this instance.

Where Charlotte’s Web is concerned, Hart notes Ringo remembered selling Harle Tsu seeds to the proprietors of Charlotte’s Web during a High Times Cannabis Cup. If Charlotte’s Web came from those seeds, then its lineage would be unique. But the plot thickens, as Ringo’s assistant at the time shared that the party visited the farm later, purchasing Harlequin and Sour Tsunami starts, complicating the issue.

Continuing Tradition

Ringo passed away in 2014 from lung cancer. With little warning, he was diagnosed with Stage 4 cancer and given just two months to live.

Though Hart said they consulted with some of the top experts in cannabis medicine, they were encouraged to do a round of radiation due to the severity and the location of the tumor.

“He immediately began eating the oil,” Hart shared. “He was ingesting his own CO2 high-THC oil, with a 3:1 CBD. He never regained any strength after the radiation to even be able to try the chemo.” The severe diagnosis and subsequent radiation treatment were too much to handle in the end.

The genetics he left behind are his legacy, carried on by his children, who were raised farming in Humboldt.

His eldest son, Levi and his wife Danielle, now run the Southern Humboldt Seed Collective, and are the keepers of the cultivars.

“The cooperative was formed to help support local farmers and be able to provide enough CBD medicine to meet supply and demand,” Hart added. “We provide clones of our genetics, the farmers grow it, and the cooperative purchases it. We have a couple CO2 extractors and have applications pending for a dispensary and a manufacturing facility.”

Hart said she’s not the farmer Ringo was but she’ll never be far away from the magic he made.

“CBD is everywhere now and we as a cooperative are very proud of Ringo’s legacy,” she concluded. “He was extremely generous, which is why the cultivars he created are so widespread. He believed in helping others for the greater good.”

Read next: CBD Oil: Easing the Pain


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Written by Sharon Letts | Writer, Television Producer of Off the Beaten Path & Host of In and Out of the Garden

Profile Picture of Sharon Letts

Writer and Producer Sharon Letts began her life's work at age of 24 as a flower gardener in Southern California. Sharon produced and hosted visiting gardening show In and Out of the Garden for local television; then executive produced Off the Beaten Path, a travelogue in California for PBS. Today Sharon writes internationally for many publications, has published two works of fiction, and is currently developing intelligent TV shows on cannabis as medicine.

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