Jack Herer by New420Guy Seeds
19 other breeders' versions of Jack Herer — compare flowering times side by side →
Jack Herer is one of those names that carries absolute weight in this culture. Originally bred by Sensi back in the 90s to honor the "Emperor of Hemp" himself, it’s a three-way collision of Haze, Northern Lights #5, and Shiva Skunk. Over the years, pretty much every seed bank has released their own version of Jack, and New420Guy Seeds has done a solid job putting out a feminized line that captures that classic sativa-dominant magic. But make no mistake, Jack is a plant that demands a little respect in the grow room.
When you run this strain, you have to be ready for the stretch. It's notorious for having a few distinct phenotypes. You might get a shorter, more indica-leaning plant that finishes quickly, but more often than not, you're going to find that aggressive sativa pheno that wants to touch your grow lights. I’ve seen these things triple in size the second you flip them to 12/12. You've got to stay on top of your training and canopy management, otherwise it'll take over your entire tent. And a quick word of warning—because of the heavy Haze influence, it can throw a rogue nanner if you stress it out with light leaks or crazy temp swings, so keep your environment tight.
But when you get it right, the harvest is legendary. The buds dry down into these spear-shaped colas that just reek of sharp pine, hazy spice, and a bit of sweet earth. The high is exactly what made Jack famous in the first place: a blistering, clear-headed rush of energy that eventually settles into a warm, comfortable body buzz. It’s my go-to smoke when I need to get out in the garden and actually get some work done.
🏆 Legendary Foundation Strain
This is one of the most influential cannabis varieties in history. Jack Herer has been used to breed 245 documented descendant strains in our database, making it a cornerstone of modern genetics.
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🧬 Explore the family: Double Jack · Zwarte Jan · Original Herer · Greenbud Seeds - Budmaker Auto · Jack Herer · Jack Herer · Mother Chucker's Seeds - Jacktiva · Galactic Jack
Growing Jack Herer: what to expect
As a hybrid, expect a moderate stretch after the flip (around 100%) — but watch the plant, not the label: phenotypes within Jack Herer can lean either direction. Whatever the listing says, the cut in YOUR tent is the ground truth: log feedings, readings, and photos, and let the trends — not the label — drive decisions.
Jack Herer FAQ
Is Jack Herer an indica or a sativa?
The breeder doesn't specify — treat it as a hybrid and read the plant.
What environment does Jack Herer like?
Standard cannabis bands work well: VPD 0.8–1.1 kPa in veg and 1.0–1.4 kPa in flower, with humidity stepping down from 65–75% as a seedling to 40–50% in late flower. See the stage-by-stage table on this page.
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Facts compiled from public breeder listings. Growing Jack Herer? A structured journal — with your feedings, readings, and photos — is how you find what THIS cut actually wants.
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