Blues by Underground Orig.

Blues strain photo
Type indica/sativaFlower ±60 daysCross Blues × KillerSkunk

2 other breeders' versions of Blues — compare flowering times side by side →

If you were running lights in the UK underground back in the late 80s and 90s, you already know about the Blues—or as the Sheffield lads called it, the Livers. This clone-only legend was a staple in the North, holding its ground right alongside Cheese and Psychosis as a pillar of British cannabis history. While the true origins of the Livers cut are still hotly debated in forum threads, most old heads agree it was a freakishly pungent, unique phenotype of Skunk #1, though rumors of Northern Lights or Shiva Skunk lineage still float around. Fast forward to 2010, and Underground Originals (UGORG) did the scene a massive favor by hitting the original clone with a Killer Skunk to release Blues in regular seed form. They later dropped backcrosses (Bx1 and Bx2) to lock down that classic funk for those of us who couldn't get our hands on the cutting.

Growing the Blues is a lesson in odor control. I can't stress this enough: if you aren't running a brand new, high-CFM carbon filter, your entire street is going to know what you're up to. The smell is violently loud—a sweetly rotten, fermenting skunk funk that some growers describe as sour berry mixed with sharp cheese or a dirty gym locker. The plants are vigorous and resilient, usually finishing up around 60 days in flower. While the bud density can fluctuate depending on your environment, they consistently push out incredibly sticky, resin-drenched colas. You might find a few different phenos in the UGORG packs, ranging from a sweeter blueberry muffin profile to straight-up offensive skunk's ass.

The smoke is where Blues really secures its legendary status. Instead of the modern, anxiety-inducing, heart-racing highs, this strain delivers pure "grin fuel." It’s an uplifting, euphoric, and sociable buzz that expands your mind and keeps you laughing. It’s that classic, clear-headed daytime stone that makes you want to get creative or just sit around talking shit with your mates. The flavor translates perfectly from the smell, coating your mouth with a thick, hashy, rotten-berry funk that lingers long after you put the joint out.

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Similar strains

UGORG#1Underground Orig. · ±63 daysSmellyBerryUnderground Orig. · ±53 daysPsycho SisterUnderground Orig. · ±60 daysNonameUnderground Orig. · ±67 daysHoney BadgerUnderground Orig. · ±60 daysOldtimesUnderground Orig. · ±60 daysBlueberry Brulee 2.0Covert Genetics · ±60 daysBlueberry BudSagarmatha · ±60 daysChemistMr. Ghost · ±60 daysCherries, Berries & Funk V2Strait A Genetics · ±60 daysCherry BreathThugPug Genetics · ±60 daysCherry DieselMTG Seeds · ±60 daysAll Underground Orig. →
BreederUnderground Orig.
Typeindica/sativa
Flowering time±60 days
EnvironmentOutdoors
LineageBlues × KillerSkunk
DescendantsAuto Blues, Bluedawg, Underground Originals - KillerSkunk, SmellyBerry, Brixton Bluez, Fromage Blue, Blazing Blues, Black N Blues, UK Bluez, Psycho Sister, Blues, UGORG#1, UK Scottish Power, Noname, Psychosis x Blues, SmellyBerry

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🧬 Explore the family: Blues · Auto Blues · Bluedawg · Underground Originals - KillerSkunk · SmellyBerry · Brixton Bluez · Fromage Blue · Blazing Blues · Black N Blues

Ancestry Pedigree

Blues
Clone Only Strains
Skunk Nr1
Sensi Seeds
Skunk Nr1
The Seed Bank
Skunk Nr1
Cultivators Choice
Afghanistan Indica
Original Strains
Mexico Sativa
Original Strains
Colombia Sativa
Original Strains
KillerSkunk
Underground Originals
Blues
Clone Only Strains
SmellyBerry
Underground Originals
Blues
Clone Only Strains
Blueberry
DJ Short
Blueberry Line
Unknown or Legendary
Temple Flo
DJ Short
Floral Line
Unknown or Legendary
Purple Thai
Unknown or Legendary
Highland Oxacan Gold
Unknown or Legendary
Mexico Sativa
Original Strains
Chocolate Thai
Unknown or Legendary
Thailand Sativa
Original Strains
Afghani
Unknown or Legendary
Afghanistan Indica
Original Strains
HTAF
Unknown or Legendary
Thailand Sativa
Original Strains
Afghani
Unknown or Legendary

Growing Blues: 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 Blues or KillerSkunk 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.

Blues FAQ

How long does Blues take to flower?

Blues typically flowers in around 60 days after switching to a 12/12 light schedule. Individual phenotypes vary, so judge harvest readiness by trichome color, not the calendar.

Is Blues an indica or a sativa?

Blues is listed as indica/sativa.

What are the parents of Blues?

Blues was bred from Blues × KillerSkunk by Underground Orig..

What environment does Blues 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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Published by Cultivar (logmygrow.com), a structured grow journal. These reference bands are the same ones the app grades real grows against. Free to cite with a link. Some outbound product links are affiliate links — see disclosures.