If you don’t know your weed history, you don’t know where you’re toking from.

For the 50th anniversary of 420, we at Leafly produced five expertly reported strain family genealogies that capture most of the top 50 popular cannabis varieties on shelves today. Celebrate the iconic stoner holiday by picking up a legendary strain and learning how it was created by some of the craftiest growers in the cannabis industry.

These strain family genealogies—and the posters we made—are like CAT scans of contemporary weed culture. If you understand how major families connect, you can decipher the myriad new crosses and buy and smoke like a pro, with a sense of place and time deepening your high.

This isn’t just effete, craft beer-sniffing. Cannabis is an $18.3 billion US industry that employs 321,000 people. Trendy cultivars are million-dollar pieces of intellectual property that make and break breeders and growers’ careers. There are thousands upon thousands of strains, with seemingly hundreds of new ones coming out each week.

So we assembled the best cannabis journalists in the world to interview the most primary sources, and write first drafts of weed history that could credibly sit in the Library of Congress. Check em out:

What is a marijuana strain family?

Weed strain families are similar to human families in a number of ways. Just like people, cannabis comes in two sexes, male and female (mostly—like humans, cannabis can also contain intersex genes that have led to some amazing strains, like Cherry Pie.)

Male pollen usually fertilizes female pistils, leading to offspring (seeds) that mix the genes of both parents.

While modern humans prefer random love matches, cannabis breeders select marijuana mates for traits they want to see in the kids, like pungent aroma and high THC potency.

Certain marijuana offspring (or “crosses” or “hybrids”) look, smell, and feel so desirable, breeders select and cross them again and again, thus creating large families of different strains that all contain some of the parents’ genes.

Forbidden Fruit (Matt Stangel for Leafly)

The original Haze lines from 1970s, Santa Cruz, CA Haze Brothers started the Haze family of strains that today includes Blue Dream, Super Silver Haze, Super Lemon Haze, and Jack Herer.

Save this poster of notable Haze strain family members and friends. (Leafly, 2021)
Save this poster of notable Haze strain family members and friends. (Leafly, 2021)

The original ‘70s Mendo Purps led to today’s Purps family that includes Granddaddy Purple, Grape Ape, Cherry Pie, and so on.

Tap or click to open and save a big version of this poster. Happy420!(Leafly)
Tap or click to open and save a big version of this poster. Happy420! (Leafly)

The OG Kush family started in the mid-’90s with a mysterious Florida clone, grown in Silver Lake, CA, that took over the state and then the world.

OG Kush’s parentage is speculative, but if you like OG, try everything on this poster. (Leafly)
OG Kush’s parentage is speculative, but if you like OG, try everything on this poster. (Leafly)

The first Tangie in the 2000s near Yosemite, CA strain led to an entire Tangie family with Sour Tangie, Clementine, Mimosa, Forbidden Fruit, and Squirt.

tangie poster
Tap or click the image to open up and save this poster of Tangies. (Leafly)

And the Cookies and Cakes family began in San Francisco in the mid-200s with Girl Scout Cookies (aka GSC) leading to Sunset Sherbert, Gelato, Wedding Cake, Runtz, and so much more. 

GSC origin stories abound. But the strain's impact is not up for debate. (Leafly)
Tap or click to open, save and print this poster. GSC origin stories abound. But the strain’s impact is not up for debate. (Leafly)

Who are the people behind the trees?

Every strain you smoke started in the imagination of some loving, slightly obsessed breeder. Like “Ooooh, I want to take the citrus in Tangie and add the dank of Cherry Pie.”

Boom—Forbidden Fruit.

Our expert journalists reached out to those breeders to get cannabis’ history direct from their mouths, including:

  • Haze’s Arjan Roskam, co-founder of Green House Coffeeshop and Green House Seed Company;
  • Purps’ Todd McCormick at Authentic Genetics;
  • Tangie’s Crockett of Crockett Family Farms;
  • OG Kush’s Josh “Josh D” Del Rosso;
  • Sunset Sherbert’s Mario “Mr. Sherbinski” Guzman;
  • and many, many others.

It’s hard to imagine in 2021 as legalization spreads, but these often pseudonymous breeders faced lifetimes in prison under prohibition laws. Thank you to every breeder that answered our DMs, picked up the phone, and shared some history and photos.

The book of cannabis—revisions expected

There’s no international body arbitrating strain claims. It’s a free-for-all, and weed genealogists need to be private detectives.

Leafly did solid work with a dedicated budget, a group of pro reporters, and a lot of time. Still, this project confronted the limitations of time, memory, prohibition, commercial competition, and good old-fashioned human error.

We found most strain history conflicts boil down to a few factors:

  • Two or more breeders naming different strains the same name. For example, two breeders sell two Grape Apes, each with different parents;
  • Two or more breeders, growers, or sellers naming the same strain different names. For example, most OG Kush variants come from a few core types.
  • Taxonomical confusion—cannabis is full of 3, 4 and 5-way crosses, and backcrosses. For example, GSC’s parentage is “F1 Durban” to Flo Rida OG. A lot of places just list it as Durban. Tropicanna Cookies “F1” came from Harry Resin at Bloom Seed Co, while Tropicanna Cookies “F2” came from Oni Seeds.
  • The fog of prohibition and commerce. Strain parentage gets lost—no one knows what OG Kush’s parents are. Or today, trade secrets reign—Archive Seeds will not disclose some parents.

We expect other weed historians to stand on our shoulders and do even better. Even then, breeder drama springs eternal.

More strain families out there to map

This rewarding, long-overdue project got us amped to map more genealogies and empower more shoppers in 2021 and beyond.

In the future, look out for our Skunk family genealogy. And, hopefully, deep dives into:

Here’s to a historic and happy 420! We hope you enjoy it.

Let us know how we did, and recommend other essential families in the comments below.

David Downs's Bio Image

David Downs

David Downs directs news and lifestyle coverage as the California Bureau Chief for Leafly.com. He’s written for WIRED, Rolling Stone and Billboard, and is the former cannabis editor of the San Francisco Chronicle, as well as the author of several cannabis books including ‘Marijuana Harvest’ by Ed Rosenthal and David Downs. He co-hosts The Hash podcast. TW: @davidrdowns | IG @daviddowns

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