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…

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