Grimace OG: The Grape Gas Heavyweight
Grimace OG: The Grape Gas Heavyweight
Strain Overview
Type: Indica-Dominant Hybrid (~75% Indica / 25% Sativa)
Breeder: Archive Seed Bank
Lineage: Purple Urkle x Face Off OG Bx1
Market Status: The "Purple Knockout"; Grimace OG is an award-winning masterclass in West Coast breeding. Archive Seed Bank took the notoriously slow-growing, low-yielding Purple Urkle clone and injected it with the massive structural vigor and raw horsepower of their Face Off OG male. Taking home 3rd Place Indica at the 2013 Los Angeles High Times Cannabis Cup, it tests reliably in the 20% to 25% THC range. It delivers a deeply euphoric, giggly onset that rapidly melts into a heavy, nerve-calming physical stone. It produces chunky, beautifully colored buds that reek of sweet concord grapes, floral violet, and pungent, abrasive OG gas.
THC Content: High (20% – 25%+)
Dominant Terpenes: Myrcene, Caryophyllene, Linalool, Limonene
Key Effects: Euphoric and Giggly Onset, Deep Muscle Relaxation, Chronic Pain Relief, Appetite Stimulation, Heavy Couch-Lock
Grimace OG is the ultimate crop for the purple weed aficionado, the grower who loves the Urkle flavor but hates its growth structure, or the medical patient who needs a heavy-handed, nerve-soothing evening strain.
If you love old-school "purps" but feel they lack the devastating punch of a modern gas strain, Grimace OG is the perfect compromise. Archive Seed Bank is world-renowned for identifying the weak points of legendary clone-only cuts and fixing them with their Face Off OG genetics. Here, they successfully captured the mouth-watering, sweet berry and grape flavor of the Humboldt County legend and backed it up with the dizzying, face-melting potency of pure West Coast fuel. If you want an 8-to-9-week indoor plant that boasts spectacular purple bag appeal and tastes exactly like grape soda mixed with raw diesel, this award-winning hybrid is a mandatory addition to your garden.
History and Lineage: Fixing the Purple Legend
The creation of Grimace OG was driven by a desire to preserve one of California's most cherished flavor profiles while making the plant actually viable for serious cultivators.
The Purple Mother (Purple Urkle): The foundation is the legendary Purple Urkle cut hailing from Humboldt County. While universally praised for its incredible sweet grape/berry flavor and deeply relaxing effects, Urkle is infamous among growers for being painfully slow in the vegetative stage and delivering very low yields.
The Devastating Father (Face Off OG Bx1): To fix the growth structure, speed up the vegetative phase, and dramatically boost the THC ceiling, Archive utilized their flagship Face Off OG male. This strain is known for its intense, heavy-branching vigor and abrasive, lung-expanding gas.
The Synthesis: The resulting offspring, Grimace OG, was an absolute triumph. It retained the beautiful purple hues and sweet grape terpenes of the mother but grew with the aggressive speed and heavy yield of the father. It validated its elite status by placing at the 2013 LA High Times Cannabis Cup.
Terpene Profile: Sweet Grape Soda and Raw Fuel
Grimace OG offers a beautifully contrasting aromatic profile. It perfectly balances the sweet, fruity notes of classic purple cannabis with the sharp, chemical bite of a heavy OG.
Dominant Terpenes
Myrcene (The Ripe Grape): The heavy, dominant anchor. It provides a massive, juicy foundation of sweet concord grapes, ripe berries, and musky earth, driving the intensely sedating physical effects of the high.
Caryophyllene (The Peppery Gas): Highly prominent, it cuts through the sweetness with a robust, warm peppery spice and classic raw fuel aroma that acts as a potent anti-inflammatory.
Linalool (The Sweet Floral): Inherited heavily from the Urkle side, it adds a distinct, soothing note of sweet violet, lavender, and floral candy that smooths out the harsh OG exhale.
Limonene (The Sour Citrus): Works quietly on the backend, adding a sharp splash of tangy lime and sour citrus that elevates the initial aroma.
Flavor Notes:
The Aroma: Loud, sweet, and gassy. It smells of grape soda, sweet floral perfume, damp earth, and sharp motor oil.
The Smoke: Incredibly smooth yet lung-expanding. It tastes of sweet berries and grape candy on the inhale, leaving a highly distinct, spicy pine and earthy OG hash finish on the exhale.
Strain Effects: The Happy Sedative
With THC levels consistently crossing the 20% threshold, Grimace OG provides a highly enjoyable, two-part experience. It is famous for being surprisingly uplifting before the heavy Indica genetics drop the anchor.
The Experience
The Giggly Lift: The onset is remarkably happy. Unlike some pure Indicas that instantly make you groggy, Grimace OG begins with a euphoric, slightly hazy, and very giggly cerebral rush. It is an incredible mood elevator that completely wipes away a bad day.
The Nerve Melt: Within 30 minutes, the medicinal benefits of the Purple Urkle shine through. A profound, deep-tissue physical relaxation washes through the body. It is highly regarded by medical patients for soothing severe nerve pain, muscle spasms, and joint aches.
The Heavy Anchor: As the high matures, the Face Off OG genetics assert dominance. You will experience a massive, undeniable physical couch-lock. Your limbs will feel heavy, and your motivation to leave the house will drop to zero.
The Munchies and Sleep: Like many great OG crosses, it will heavily stimulate your appetite before gently guiding you into a deep, heavy, and restorative sleep.
Best For: Evening consumption, unwinding after a stressful workday, managing severe chronic pain (especially nerve pain), stimulating appetite, and combating insomnia.
Growing Grimace OG: The Vigorous Purple
Archive Seed Bank bred Grimace OG specifically to fix the painful vegetative speed and low yields of pure Purple Urkle, making it a highly rewarding and efficient plant for indoor growers.
Growth Structure
The Size: Medium, Bushy, and Vigorous. It exhibits strong hybrid vigor. Indoors, it grows much faster than pure Urkle, developing a sturdy, bushy structure with thick lateral branches capable of holding heavy weight.
The Visuals: Dark Purples and Frosty Calyxes. The bag appeal is 10/10. The buds form chunky, round, incredibly dense calyxes. During late flower (especially with cooler nighttime temperatures), the foliage and buds will frequently transition to stunning shades of deep violet and dark purple, heavily coated in sticky white trichomes.
The Yield: Solid to High. This is where the Face Off OG genetics shine. Indoors under intense LED lighting, experienced growers can easily pull a highly rewarding 400–500g/m²—a massive improvement over traditional purple strains.
The Time: Fast and reliable. Once flipped to a 12/12 light cycle, it requires roughly 8 to 9 weeks (approx. 56–63 days) to reach absolute peak maturity.
Grower’s Tip: Drop the nighttime temperatures in late flower. While Grimace OG will naturally show some purple hues due to its genetics, dropping your grow room temperatures by 10-15 degrees (Fahrenheit) during the "lights off" cycle in the final two weeks of flowering will dramatically enhance the dark violet and black coloration of the buds.
Similar Strains / Lineage Relations
If you respect the sweet grape/gas terpenes, the improved growth structure, and the heavy physical stone of Grimace OG, you should explore these related genetics:
Purple Urkle (Clone Only / Various Breeders): The Legendary Mother.
Why: If you want to experience the pure, unadulterated foundation of the sweet grape and violet flavor profile, and you have the patience to deal with a very slow-growing, low-yielding plant.
Granddaddy Purple (Ken Estes): The Purple Standard.
Why: If you love the heavy Indica effects and sweet grape/berry flavors of Grimace, but want a classic cross (Purple Urkle x Big Bud) that leans even heavier into the sweet fruit and massive yields, dropping the harsh OG gas entirely.
Casper OG (Archive Seed Bank): The Ghostly Sibling.
Why: As previously reviewed, this is Ghost OG crossed with the same Face Off OG male. Grow this if you want to trade the sweet grape and purple hues for an aggressively sharp lemon-pine, heavy fuel, and ghostly white resin profile.
Final Verdict: The Grape Gas Heavyweight
Grimace OG is a brilliant example of functional, high-end cannabis breeding. Archive Seed Bank successfully took the world-class, mouth-watering grape and berry flavor of Purple Urkle and backed it with the extreme potency, structure, and yield of Face Off OG. It is relatively easy to grow, highly responsive to training, and rewards the cultivator with absolutely stunning, purple-hued buds that boast a uniquely perfect blend of sweet candy and harsh fuel. If you want a top-tier evening strain that makes you giggle before gluing you to the couch, this award-winning heavy hitter is an absolute must-have.
You should choose Grimace OG if:
You love classic "Purple" grape and berry flavors but demand the heavy punch of a modern OG.
You want an Indica-dominant hybrid that offers a happy, euphoric head high before a heavy body stone.
You are a medical patient seeking profound relief from nerve pain, stress, and insomnia.
You are an indoor grower looking for a vigorous, high-yielding purple strain.
Score: 9.4/10 (The Purple Knockout)