Auto Assassin by Short Stuff Seedbank: A Comprehensive Strain Guide

Overview

Auto Assassin is a day‑neutral, autoflowering hybrid created by Short Stuff Seedbank, built from a ruderalis, indica, and sativa heritage. The cultivar was designed to deliver photoperiod‑level potency with the compact, fast turnaround of an autoflower. Growers typically gravitate to Auto Assassin for its quick seed‑to‑jar timelines and robust, hybrid‑leaning effects.

As an autoflower, Auto Assassin transitions to bloom based on age rather than day length, allowing flexible scheduling under 18 to 24 hours of light. In practice, many indoor cultivators finish plants in roughly 70 to 80 days from sprout, with some phenotypes wrapping up closer to 65 days. This makes it a solid choice for perpetual harvests and multi‑cycle outdoor runs in warm seasons.

The sensory profile trends spicy, herbal, and woodsy with citrus or pine high notes depending on phenotype. The structure often shows medium internode spacing with resinous calyx stacks and a blend of sativa vigor and indica density. While exact cannabinoid values depend on environment and phenotype, community reports position Auto Assassin among the more potent autos in Short Stuff’s stable.

History and Breeding Origins

Short Stuff Seedbank was one of the early champions of modern autoflower genetics, pushing the category beyond low‑potency novelty lines in the late 2000s and early 2010s. Auto Assassin emerged from that pioneering era as a hybrid intended to capture a hard‑hitting effect profile in a compact, fast plant. The breeder maintained the exact parentage as a proprietary polyhybrid, emphasizing a balanced blend of sativa expression with indica density and a stabilized ruderalis clock.

The name Auto Assassin has appeared in projects beyond Short Stuff, so it is helpful to clarify lineage context. A separate Auto Assassin line exists from GeneSeeds Bank, and that line has been used by other breeders as a parent. For example, seedfinder genealogy data lists M8 from Original Strains crossed with Auto Assassin from GeneSeeds Bank as part of their breeding work, underscoring that different houses can share a strain name while maintaining distinct genetics.

Short Stuff’s Auto Assassin belongs to the ruderalis, indica, and sativa heritage category, aligning with the breeder’s broader approach to balanced autos. The goal was to retain speed and reliability without sacrificing potency, aroma, or bag appeal. Over multiple generations, the line was stabilized for autoflower timing and a relatively uniform, medium stature, while still expressing hybrid vigor.

Across forums and grow logs during the 2010s, Auto Assassin developed a reputation as a no‑nonsense performer for newer growers. Experienced cultivators appreciated its consistency under long‑day indoor schedules and its ability to slot into perpetual harvest rooms. The strain continues to see use where rapid turnover, modest plant counts, and resin‑forward flowers are priorities.

Genetic Lineage and Taxonomy

Auto Assassin’s genetic makeup is a tri‑heritage blend: ruderalis for day‑neutral flowering, indica for density and body expression, and sativa for vigor and uplift. While Short Stuff has not disclosed the exact photoperiod parents, the architecture suggests a hybrid balance rather than a narrow, single‑line expression. Growers often describe the plant as sativa‑leaning in height and leaf shape early, with indica‑style calyx stacking as bloom progresses.

Ruderalis contributes photoperiod independence via the FT gene network and related flowering pathway adaptations. This day‑neutral trait is dominant in stabilized autos and triggers floral initiation by age, generally between days 18 and 28 from emergence. In Auto Assassin, this often manifests as preflowers by week three and visible pistil formation by week four, even under 18 to 24 hours of daily light.

Indica ancestry contributes to resin density, thicker calyxes, and a satisfying low‑end body effect that rounds the experience. Sativa contributions show up as stronger apical stretch, moderate internode spacing, and a brighter mood lift in the head. The resulting chemotype tends to be balanced enough for afternoon use, yet potent enough to anchor evening sessions.

Taxonomically, this hybrid would be described as Cannabis sativa L. with ruderalis admixture. Chemotypically, most autos in this class fall into a Type I profile dominated by THC with low CBD, and Auto Assassin is commonly reported in that category. Total terpene yields tend to land in the mid‑range for modern autos, with some phenotypes pushing into more expressive terpene outputs when dialed in.

Appearance and Plant Structure

Auto Assassin usually presents a medium stature, often finishing between 50 and 100 cm indoors without training. The plant has a central leading cola with a halo of lateral branches if grown untrained, and it responds well to gentle low‑stress training to create an even canopy. Internode spacing is moderate, allowing good airflow through the mid‑canopy in most environments.

Leaves are typically medium green with sativa‑leaning leaflets early that broaden slightly as flowering advances. As the plant matures, calyxes swell and stack tightly, developing a frosty coating that intensifies in the final three weeks. Pistils start ivory to light peach, often taking on amber or rust hues as they mature.

Trichome coverage is a visual highlight and is particularly dense on the upper buds, sugar leaves, and bract tips. Well‑grown flowers display a glassy sheen under magnification, with capitate stalked glands dominating. Under cool night temperatures near the end of bloom, some phenotypes exhibit faint purple streaking along sugar leaves and calyx tips.

Bud structure trends toward medium density that avoids the rock‑hard nug problem seen in some heavy indicas, promoting better dry‑down and reduced mold risk. The overall bag appeal is boosted by a contrast of frosted resin, orange‑rust pistils, and lime‑to‑forest‑green calyxes. Proper drying preserves a granular trichome texture and a crisp break, with minimal leafiness when manicured at harvest.

Aroma and Flavor

The dominant aromatic themes are spice, earth, and wood, layered with citrus or pine top notes depending on the phenotype. Freshly broken buds can release peppery caryophyllene tones with a subtle herb garden quality reminiscent of thyme and bay leaf. As the flower warms, secondary notes of sweet lemon rind, pine sap, and faint floral accents emerge.

On the palate, the first impression leans peppery and herbal, followed by a cedar or sandalwood mid‑tone. The finish often brings a clean citrus snap that keeps the profile lively rather than heavy. Vaporization at 175 to 185 C sharpens the citrus and pine fraction, while combustion tends to emphasize the spicy, earthy baseline.

Curing has a significant effect on the aromatic balance and smoothness. A slow cure at 58 to 62 percent relative humidity for at least three weeks rounds the edges and elevates the sweeter facets. Improperly fast dries can mute citrus elements and push a dull hay note, so maintaining a 10 to 14 day dry is recommended.

Well‑grown examples exhibit noticeable room‑fill within a minute of grinding, an indicator of healthy terpene retention. Total terpene content in autos varies widely; growers who optimize environment and harvest timing report more vibrant and layered aromatics. Glass storage with minimal headspace preserves brightness, while plastic containers tend to subdue top notes over time.

Cannabinoid Profile and Potency

Auto Assassin is typically a THC‑dominant Type I chemovar, consistent with modern autoflowers aimed at adult‑use potency. While official, universally published COAs for this specific line are limited, grower‑submitted tests for comparable Short Stuff autos often report THC in the mid‑teens to low‑20s. A realistic expectation for well‑grown Auto Assassin is approximately 16 to 22 percent THC by dry weight, with outliers on either side depending on phenotype and cultivation.

CBD is generally low, often below 1 percent, aligning with the psychoactive forward profile. Minor cannabinoids like CBG commonly register in the 0.2 to 1.0 percent range, particularly if harvested slightly earlier when CBG degradation to other compounds is less advanced. Trace THCV may appear in sativa‑leaning phenotypes but usually at minor levels.

Potency outcomes correlate strongly with environmental factors and harvest timing. For example, running a consistent PPFD of 700 to 900 µmol m‑2 s‑1 in late flower, keeping canopy temps near 24 to 26 C, and ensuring adequate calcium and magnesium availability often pushes results toward the upper bound. Conversely, frequent drought cycles, low light intensity, or overfeeding nitrogen deep into bloom can shave several percentage points from potential THC.

Method of consumption also shapes perceived potency. Inhalation typically produces noticeable onset within 5 to 10 minutes, with peak effects at 30 to 45 minutes. Oral ingestion, after proper decarboxylation and infusion, produces a slower onset of 45 to 120 minutes with a longer plateau lasting 4 to 6 hours.

Terpene Profile and Minor Compounds

The top terpene trio most commonly expressed in Auto Assassin phenotypes includes beta‑caryophyllene, myrcene, and limonene. In many autos, these three account for 50 to 75 percent of the total terpene fraction, and Auto Assassin commonly follows that pattern. Secondary contributors often include humulene, alpha‑pinene, beta‑pinene, and linalool.

In robust expressions, beta‑caryophyllene may range around 0.3 to 0.8 percent by dry weight, lending peppery spice and potential CB2 receptor activity. Myrcene often presents around 0.2 to 0.7 percent, contributing earthy, herbal notes and a relaxed body feel. Limonene tends to land near 0.1 to 0.4 percent, brightening the profile with citrus and supporting mood elevation.

Total terpene content in well‑grown autoflowers generally spans 1.0 to 2.5 percent, with standout plants exceeding 3.0 percent. Achieving the higher end frequently requires careful drying and curing practices that maintain volatile monoterpenes. Reducing canopy temperature by 1 to 2 C during the last two weeks can help preserve top notes without sacrificing ripening.

Minor volatiles like ocimene and terpinolene can appear in certain phenos, infusing a sweet, green character when present. While not dominant, these can subtly shift the sensory impression toward a brighter, more sativa‑coded bouquet. Sampling across multiple seeds increases the chances of finding such expressions for personal selection.

Experiential Effects and Use Cases

Auto Assassin delivers a hybrid experience that opens with alertness and uplift, followed by a gradual body calm. Early effects often include a clear headspace, mild euphoria, and sensory engagement that pairs well with casual socializing or creative hobbies. After 45 to 90 minutes, a soothing physical ease tends to set in, smoothing tension without heavy couchlock in most phenotypes.

At moderate doses, many users report improved focus for light tasks, music enjoyment, and appetite stimulation. Larger doses shift the balance toward sedation, particularly in evening sessions or with myrcene‑forward phenotypes. Individuals sensitive to THC should start low to minimize transitory anxiety or racing thoughts.

Common side effects include dry mouth and dry eyes, which correlate with dose and consumption method. Rarely, susceptible users can experience transient dizziness or an elevated heart rate during the initial onset. Staying hydrated and pacing dose increments helps moderate these effects.

The strain’s versatility makes it suitable from late afternoon into evening for most users. Daytime use is feasible at small doses, particularly via vaporization to limit combustion heaviness. For social contexts, the upbeat onset and friendly mood lift can be a reliable conversation starter before the tranquil landing.

Potential Medical Applications

While strain‑level medical evidence is limited, the chemotype features of Auto Assassin suggest potential utility in several symptom domains. THC‑dominant hybrids with caryophyllene and myrcene often support short‑term relief from stress, low mood, and minor pain. The initial uplift can help with motivation and appetite in individuals managing appetite suppression.

For pain, the blend of THC and beta‑caryophyllene may help attenuate nociceptive signaling and reduce the affective component of pain perception. Users commonly report relief with neuropathic tingling, menstrual cramping, or post‑exercise soreness within 30 to 60 minutes of inhalation. Myrcene’s sedative synergy can further support evening relaxation and sleep onset for those with ruminative stress.

Caution is warranted for anxiety‑prone individuals, as higher THC doses can paradoxically elevate anxiety. Low‑and‑slow dosing, potentially paired with CBD‑rich products, can moderate the ceiling on psychoactivity if sensitivity is a concern. Patients should consult health professionals where medical cannabis is supervised to ensure safe, coordinated care.

For nausea, inhalation often provides rapid relief within minutes, a timing advantage compared to oral routes. Oral preparations based on Auto Assassin may be helpful for longer‑lasting effects in chronic pain or sleep contexts. As always, individual biochemistry dictates response, so journaling dose, timing, and outcomes is advisable.

Cultivation Guide: Indoors

Auto Assassin is well‑suited to small tents and closets, thriving under 18/6, 20/4, or even 24/0 lighting schedules. A common indoor target is 20 hours on and 4 hours off to balance growth with energy costs. Most phenotypes run 70 to 80 days from sprout to harvest, with earlier finishers at 65 to 70 days and long‑running outliers up to 85 days.

For light intensity, begin seedlings at 250 to 350 µmol m‑2 s‑1 PPFD in the first 7 to 10 days. Increase to 450 to 650 PPFD during early veg weeks 2 to 3, then 700 to 900 PPFD from early bloom onward. Advanced growers can push up to 1,000 PPFD late flower if CO2 is elevated and environmental controls are tight.

Maintain day temperatures around 24 to 28 C and nights around 20 to 22 C for steady metabolism. Relative humidity targets of 65 to 70 percent for seedlings, 55 to 60 percent for early veg, and 45 to 50 percent in bloom keep VPD in a favorable range of 0.8 to 1.2 kPa. Strong, oscillating airflow above and below the canopy is essential to deter microclimates and mildew.

Container size of 7 to 11 liters (2 to 3 gallons) balances root mass with autoflower timelines. Many growers start in the final container to avoid transplant shock and lost days in an already fixed lifecycle. Fabric pots improve gas exchange and help prevent overwatering, a common issue with newer growers.

Cultivation Guide: Outdoors and Greenhouse

As a day‑neutral autoflower, Auto Assassin can be run multiple times per season in temperate climates. In regions with frost‑free stretches of 120 to 150 days, two to three full cycles are feasible with staggered plantings. A typical schedule is a late spring sowing in May, a midsummer sowing in July, and a final sowing in August for an early autumn harvest.

Full sun exposure drives better yields, with 8+ hours of direct light being ideal. In northern latitudes, long summer days naturally push high daily light integrals, supporting denser flowers even under cooler conditions. In hot, arid regions, midday shade fabric or light diffusing covers can protect terpenes and prevent photorespiratory stress.

Outdoor plant height commonly ranges from 60 to 120 cm depending on genotype and conditions. Wind protection and staking for the central cola help maintain structure during late‑season storms. Greenhouses extend the season, warm nights, and guard against heavy rain that can spike botrytis risk near harvest.

Pest management outdoors benefits from integrated approaches: sticky traps, predatory mites for spid