Sour Crack by Mephisto Genetics
When the autoflower revolution kicked into high gear, Mephisto Genetics completely changed the game with Sour Crack. Designed strictly for speed, stealth, and overwhelming potency, this cross is a masterclass in modern auto breeding. The Mephisto boys took their wildly resinous, heavy-indica 24 Carat (which carries elite Afghan genetics) and slammed it into a specialized Auto Green Crack breeding project. After rigorous stabilization, they unleashed an approximately 90/10 Indica-dominant hybrid that is widely considered one of the absolute fastest-finishing, commercial-quality autoflowers on the planet.
If you blink, you might miss this plant's entire life cycle. Sour Crack routinely finishes in a blistering 55 to 65 days from sprout. Because of its hyper-fast timeline, it stays extremely compact, usually topping out around 35 to 55 centimeters. This stout, squat structure makes it the ultimate secret weapon for Sea of Green (SOG) setups or stealthy closet grows. But don't let the small stature fool you—what it lacks in height, it makes up for in pure density. The buds grow rock-hard and are so obscenely caked in trichomes that growers consistently run it specifically for high-yield hash and rosin pressing. You have to dial in your feeding early, though, because any early stunting will drastically cut your yield on a plant that flowers this fast.
The smoke from Sour Crack is intensely pungent, kicking off with a sweet, fruity sourness that some growers compare to a hazy, citrus-forward IPA. But the real danger lies in the effects. This is an incredibly potent, day-ending smoke. The Green Crack lineage hits you first with a sudden, rushing head high, but it gets rapidly overpowered by the heavy, narcotic couch-lock inherited from the 24 Carat. It's a devastatingly strong, bone-melting stone that is notorious for putting even high-tolerance veteran smokers straight to bed. If you need serious pain relief or a one-hit knockout punch in record time, Sour Crack is undeniably top-tier.
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Similar strains
| Breeder | Mephisto Genetics |
|---|---|
| Type | ruderalis/indica/sativa |
| Flowering time | ±58 days |
| Environment | Outdoors |
| Lineage | Green Crack × 24 Carat |
| Descendants | Sour Crinkle, Sour Blues, White Crack, High Voltage Auto, Sour Stomper, Sour Hound, Sour Bubblin' Crack |
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🧬 Explore the family: Green Crack · 24 Carat · Sour Crinkle · Sour Blues · White Crack · High Voltage Auto · Sour Stomper · Sour Hound · Sour Bubblin' Crack
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Growing Sour Crack: what to expect
As an indica-leaning plant, expect a modest stretch after the flip (roughly 50–100%) and dense bud structure — which makes late-flower humidity discipline the main risk: keep RH in the 40s once buds fatten to stay ahead of mold. Growers familiar with Green Crack or 24 Carat will recognize much of its behavior. 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.
Sour Crack FAQ
How long does Sour Crack take to flower?
Sour Crack typically flowers in around 58 days after switching to a 12/12 light schedule. Individual phenotypes vary, so judge harvest readiness by trichome color, not the calendar.
Is Sour Crack an indica or a sativa?
Sour Crack is listed as ruderalis/indica/sativa.
What are the parents of Sour Crack?
Sour Crack was bred from Green Crack × 24 Carat by Mephisto Genetics.
What environment does Sour Crack 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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