Written by Ad OpsHistory and Breeding Context
Auto Diesel 47 sits at the intersection of two major revolutions in modern cannabis: the rise of diesel-flavored hybrids and the maturation of autoflower genetics. Bred by Pitt Bully, the cultivar was designed to compress the big-room character of classic Diesel lines into a faster, more accessible package that performs reliably under an 18–20 hour light cycle. The breeder’s decision to lean on a ruderalis/indica/sativa heritage reflects a deliberate attempt to balance speed, structure, and resin output without sacrificing the signature fuel-and-citrus personality that made Diesel strains global favorites.
Autoflowering cannabis saw a rapid evolution in potency and yield over the past 15 years, with modern autos now reaching THC levels that rival photoperiod peers in many gardens. Industry-wide, independent lab reports from contemporary autos routinely show THC ranges between 15–25%, a stark contrast to early auto lines that averaged 7–12% THC in the late 2000s. By aligning robust hybrid vigor with an autoflowering backbone, Auto Diesel 47 typifies this next-generation performance while retaining a distinctive diesel bouquet.
The commercial and home-grow appeal of an autoflower like Auto Diesel 47 is practical as much as it is sensory. Autoflowers commonly finish from seed in 70–90 days, allowing up to four complete cycles per year in the same tent—compared to two or three for many photoperiods. For small-space cultivators and new growers, that speed translates into more harvests, more chances to iterate, and a quicker feedback loop on techniques and inputs.
Pitt Bully’s emphasis on a balanced ruderalis/indica/sativa blend suggests strategic use of each subspecies’ best traits. Ruderalis contributes photoperiod independence and quicker maturation; indica inputs shore up density and resin; sativa influences boost aroma complexity and an energetic top end to the effect profile. The result is a cultivar positioned to satisfy both terpene chasers and practical cultivators who need reliability and speed.
Because autoflower lines are frequently stabilized through multiple filial generations, breeders often keep fine-grained parentage proprietary to protect intellectual property. However, the model that Pitt Bully employs is clear enough in effect and morphology to point toward a Diesel-forward hybrid with a sweet-spicy 47-style accent. That combination historically yields expressive, high-terpene flower with a layered high and solid bag appeal, which is precisely what Auto Diesel 47 is known to deliver.
Genetic Lineage and Inferred Parentage
The official heritage for Auto Diesel 47 is ruderalis/indica/sativa, reflecting its autoflower status and hybridized base. While Pitt Bully has not published the full parental roadmap, the strain’s name suggests a Diesel-centric profile paired with a "47" lineage influence—commonly a shorthand in cannabis for hybrids inspired by AK-47-type genetics. In practice, growers routinely report a bright, citrus-fuel nose layered over a sweet, floral spice, a signature consistent with Diesel x 47-style crosses tempered by ruderalis for autoflowering.
Ruderalis genetics are present for photoperiod independence, enabling flowering based on plant age rather than daylength. In typical autos, the ruderalis contribution is kept proportionally smaller during stabilization to preserve potency, aroma, and yield aligned with indica-sativa expectations. This balance is evident in Auto Diesel 47’s ability to produce dense, frost-heavy colas while finishing rapidly—often in 70–85 days from sprout under steady 18–20 hour light.
Indica influence in the lineage is most visible in the bud structure and resin density. The colas tend to be moderately compact with a high calyx-to-leaf ratio, boosting trim efficiency and bag appeal. Sativa notes surface in the terpene ensemble: zesty citrus, volatile fuel, and a flicker of herbal sweetness that reads lively and top-heavy in the jar, especially after a 4–6 week cure.
The synergy among the three subspecies shows up in real-world garden performance. Autos with similar heritage commonly reach 60–100 cm indoors and 80–120 cm outdoors with minimal training, staying compact enough for a microgrow yet vigorous enough to fill space with lateral branches. These growth metrics align well with Auto Diesel 47’s profile, providing a practical anchor for cultivators mapping plant counts and canopy density.
Morphology and Visual Appearance
Auto Diesel 47 typically produces medium-density, resin-rich colas with a hybrid structure that leans slightly indica in bud formation. Expect lime to olive-green flowers with vivid orange pistils that darken to a rusty copper as maturity approaches. Under cool night temperatures—17–19°C (62–66°F)—anthocyanin expression can occur, giving sugar leaves a faint violet blush that enhances bag appeal.
Trichome coverage is a standout trait, with thick capitate-stalked glandular heads forming a frosty sheen that is easily visible under 3,000–4,000 Kelvin white LEDs. Under magnification, a healthy canopy near harvest will show a mosaic of cloudy trichome heads with 5–15% amber for a balanced effect target. This heavy resin output translates well to dry sift, bubble hash, and hydrocarbon extractions, where yields are typically proportional to coverage density and maturity timing.
The plant height indoors often ranges from 60–90 cm with an untrained, single-cola approach, reaching the higher end when given high PPFD and early low-stress training. Internode spacing is moderate, enabling sufficient airflow between branches while still stacking nicely in flower. Leaf shape commonly shows hybrid traits—narrower than a pure indica but broader than a pure sativa—making defoliation straightforward without risking structural integrity.
Branching is predictable, which benefits uniformity across a multi-plant run. A gentle bend of the main stem at the 3rd–4th node can create a low, even canopy of 6–10 strong branches in small pots (7–11 liters), ideal for maximizing light penetration. This morphology reduces the risk of popcorn buds when paired with a clean lollipop and consistent environmental control.
Aroma Profile
The aroma of Auto Diesel 47 centers on a classic fuel-and-citrus signature emblematic of the Diesel family, with a sweet, floral lift that evokes the "47" in its name. Top notes commonly present as petrol, grapefruit zest, and lime peel, bursting from the jar as soon as the seal is cracked. Mid-notes include white pepper, lemon verbena, and a faint herbal-tea sweetness, while the base offers earthy incense and a whisper of pine.
As plants mature, terpenes intensify substantially in the final 2–3 weeks before harvest. A well-dried and cured sample (60% RH, 18–20°C, 10–14 days) reveals a more complex bouquet where the diesel sharpness integrates with candied citrus and light florals. Total terpene content in modern autos can range from 1.5–3.5% by dry weight, and Auto Diesel 47 often sits in the mid of that band when grown under stable conditions.
Grinding amplifies the gasoline aspect quickly, which can dominate a small room—carbon filtration is strongly recommended for discretion. The aroma profile pairs nicely with foods and beverages that will not clash with volatile citrus-fuel notes, such as sparkling water with a twist of lime, green tea, or mild cheeses. For connoisseurs, the way the notes unfold from top to base can be tracked across the session, with fuel and citrus peaking early and sweet spice lingering at the end.
Flavor and Consumption Experience
On the palate, Auto Diesel 47 delivers a bright, zesty entrance followed by a clean fuel glide and a lightly sweet finish. Inhale characteristically opens with grapefruit-lime and soft herbal tones, transitioning to diesel and cracked pepper mid-draw. Exhale tends to be smoother than old-school Diesel cuts, leaving a lingering citrus-resin film and a hint of floral candy.
Vaporization at 180–190°C (356–374°F) emphasizes limonene and myrcene, showcasing citrus brightness with minimal harshness. Pushing to 195–205°C (383–401°F) brings out caryophyllene and humulene, deepening peppery earth and resin notes that appeal to classic Diesel lovers. Combustion tilts the flavor toward fuel and pepper while slightly muting the high notes, which many users find ideal for nighttime bowls or post-work sessions.
In concentrates, the profile becomes more polarized: hydrocarbon extracts exaggerate petrol and pine while rosin can highlight sweet citrus and floral spice. Tinctures and edibles made with Auto Diesel 47 often retain a faint lemon-peel bitterness; pairing with cocoa or roasted coffee flavors masks this gracefully. Mouthfeel is medium-bodied with a clean, slightly resinous finish that resists palate fatigue across multiple sessions.
Cannabinoid Profile and Potency
As an autoflower hybrid, Auto Diesel 47 generally exhibits THC-forward chemotypes, reflecting the progression of modern auto breeding. Across comparable Diesel-leaning autos, lab-verified THC values commonly range from 15–22%, with outliers reaching 24–26% under ideal cultivation. CBD is typically low, often below 1% by dry weight, while minor cannabinoids like CBG can appear in the 0.2–1.5% range.
The THC:CBD ratio is therefore strongly skewed toward THC, which shapes the energetic, sensory-forward high that users report. For inhalation, onset is rapid, with most consumers feeling clear effects within 2–5 minutes and a peak at 20–35 minutes. Duration commonly spans 2–3 hours for flower and 3–4 hours for concentrates, depending on individual metabolism, tolerance, and set/setting.
For edible preparations, decarboxylation efficiency significantly affects the potency experience. THCA converts to THC at high heat; a standard home decarb such as 105–115°C for 30–45 minutes can yield 70–90% conversion depending on material and oven precision. Edibles exhibit delayed onset (30–120 minutes) with a longer tail (4–8 hours), and users should titrate doses in 2.5–5 mg THC increments to avoid overshooting.
Total active cannabinoids in well-grown, well-cured autos often measure 18–26% by weight when adding minors to THC. While exact results vary by phenotype and grow conditions, this places Auto Diesel 47 in the same potency class as many mid-to-high strength photoperiod hybrids. Consumers sensitive to THC should approach carefully, as the cultivar’s terpene mix can make the effect feel more pronounced than milligram values alone suggest.
Terpene Profile and Chemotype Insights
Auto Diesel 47’s terpene spectrum typically features a limonene-forward citrus layer supported by myrcene, beta-caryophyllene, and pinene-humulene accents. In modern diesel-hybrid autos, total terpene content often falls between 1.5–3.0% w/w, with standout runs reaching 3.5% when environmental and nutritional inputs are optimized. A plausible distribution for a diesel-leaning auto might include limonene at 0.3–0.8%, myrcene at 0.4–0.9%, beta-caryophyllene at 0.2–0.6%, and supporting roles from alpha-pinene, ocimene, and humulene at 0.05–0.3% each.
Limonene correlates strongly with the grapefruit-lime nose and uplifting top end, while myrcene bridges citrus to earth and can soften the inhale. Beta-caryophyllene, a CB2 receptor agonist, lends peppery warmth and contributes to body comfort through peripheral pathways. Pinene and ocimene add crispness and a perceived “alert” quality, which aligns with the energetic bent reported by users in daytime contexts.
During curing, the terpene ensemble shifts as volatile monoterpenes wind down and sesquiterpenes stabilize. A 4–6 week cure at 58–62% RH can improve flavor coherence and mouthfeel, with many connoisseurs noting a smoother diesel finish at week four compared to week one. Storage at cool, stable temperatures (15–20°C) and in UV-blocking containers can slow terpene loss; improperly stored material can lose 10–30% of certain monoterpenes in a single month.
Experiential Effects, Onset, and Duration
Auto Diesel 47 usually opens with a clear, uplifting cerebral spark accompanied by sensory brightness and mood elevation. Within minutes of inhalation, users often report enhanced focus, a mild pressure behind the eyes, and a gentle rise in motivation. The middle phase brings a comfortable body hum with reduced muscle tension, while the mental state remains articulate and sociable in most contexts.
At moderate doses, the cultivar tends to support creative activities, conversation, and light physical tasks without heavy sedation. As the session lengthens, a soft relaxation sets in, reflecting the indica contribution without flattening the sativa clarity. Many report that the final tail feels calm and contented rather than drowsy, though dose and tolerance can tilt the experience toward later-evening unwinding.
Adverse effects mirror those of other THC-forward diesel hybrids. Dry mouth and dry eyes are common, appearing in roughly 20–30% of users based on self-reporting trends across high-THC strains. Anxiety or transient edginess can occur at higher doses in 5–15% of sensitive users, which can be mitigated by reducing dose, pacing inhales, or pairing with CBD at a 1:10 to 1:5 CBD:THC ratio.
Duration depends on route of administration. For smoked or vaporized flower, expect a 2–3 hour window from onset to resolution, with the peak intensity in the first hour. For concentrates, the peak arrives faster and may feel stronger, while the tail extends slightly longer; first-time users with extracts should start with one small inhale and wait at least 15 minutes before redosing.
Potential Medical Applications and Considerations
Given its likely THC-forward, limonene- and caryophyllene-rich profile, Auto Diesel 47 may be useful for mood elevation, daytime fatigue, and stress modulation. THC and limonene together can support positive affect in some users, while beta-caryophyllene’s CB2 activity may contribute to perceived body comfort and reduced inflammation. Patients with neuropathic pain, tension headaches, or mild musculoskeletal discomfort often report relief from diesel hybrids with similar chemistry.
Appetite stimulation is a well-known effect of THC, and diesel-forward hybrids are commonly used as pre-meal adjuncts among patients dealing with nausea or reduced appetite. For those managing chemotherapy-related nausea, small inhaled doses before meals can be helpful; a typical starting point is 1–2 inhalations, waiting 10–15 minutes to gauge response. For chronic pain, a microdosing approach of 2.5–5 mg THC orally in the morning and afternoon may offer steadier coverage with fewer side effects.
Anxiety-prone patients should proceed carefully, as THC can be anxiogenic in certain contexts and dose ranges. Co-administering CBD in a 1:1 to 1:4 ratio (CBD:THC) can attenuate the intensity for some individuals, and slower titration tends to reduce adverse outcomes. Those with a history of psychosis, cardiovascular instability, or pregnancy should avoid high-THC products unless under explicit medical guidance.
Because CBD in Auto Diesel 47 is typically low (<1%), this cultivar is not a substitute for CBD-dominant therapies targeting seizure disorders or inflammatory conditions requiring higher CBD ratios. Drug interactions are possible—THC is metabolized primarily by CYP2C9 and CYP3A4 enzymes—so patients on narrow therapeutic index medications should consult a clinician. As always, medical use should be individualized, with careful attention to set, setting, and symptom tracking.
Comprehensive Cultivation Guide
Auto Diesel 47 is well-suited to growers seeking a fast, aromatic harvest with robust autoflower vigor. The ruderalis/indica/sativa heritage from Pitt Bully produces a compact, highly resinous plant that thrives under long light schedules. With careful environmental control, it can finish in 70–85 days from sprout, offering multiple harvests per year in a single space.
Germination and Seedling Stage
Use fresh, viable seeds stored at 4–8°C with a stable 50–60% RH to preserve germination rates that commonly reach 90–98% in quality stock. Employ a paper towel or rapid rooter method at 24–26°C with sterile water at 6.0–6.3 pH. Expect radicle emergence within 24–72 hours; transplant to final containers early, ideally as soon as cotyledons open, to prevent auto stress from delayed pot-ups.
Place seedlings under 200–300 µmol/m²/s PPFD for the first 5–7 days, gradually increasing to 350–450 µmol/m²/s by day 10. Maintain 65–75% RH and 24–26°C leaf temperature, targeting a VPD of 0.8–1.0 kPa to encourage lush growth without over-transpiration. Water with minimal nutrients (EC 0.4–0.6) or a mild 2-1-2 profile at 0.25–0.5 mL/L of complete fertilizer until the first true leaves broaden.
Vegetative Growth (Autoflower Pre-Flower)
Autos like Auto Diesel 47 do not require a photoperiod change; run 18–20 hours of light throughout the lifecycle for maximum daily light integral (DLI). Increase intensity to 500–650 µmol/m²/s PPFD, ensuring 24–28°C canopy temperatures, 60–65% RH, and 1.0–1.2 kPa VPD. Feed a balanced vegetative regimen around 3-1-2 NPK, EC 0.8–1.2 (400–600 ppm 500-scale), with calcium and magnesium supplementation if using RO or soft water.
Train early and gently. Begin low-stress training (LST) around day 12–18 when the plant has 4–5 nodes; bend and anchor the main stem to create a flat, even canopy without topping stress. If topping is desired, perform a single, early top at the 3rd–4th node no later than day 18–21 to minimize yield penalties common in autos when topped late.
Early Flower (Weeks 3–5 from Sprout)
Pre-flowers typically appear by day 18–25, and rapid vertical growth follows. Raise PPFD to 650–750 µmol/m²/s and begin to pivot the feed to a transitional 2-1-2 or 2-1.5-2.5 NPK ratio. Keep EC around 1.2–1.5 with a focus on maintaining steady magnesium (40–60 ppm) and sulfur (20–40 ppm) to support terpene biosynthesis.
Reduce RH to 50–55% to preempt botrytis risk as sites stack. Defoliate lightly—no more than 10–15% leaf mass at a time—to open inner nodes and improve airflow. A gentle lollipop of the lowest third of the plant concentrates energy into the developing canopy while reducing popcorn production.
Mid Flower (Weeks 5–8 from Sprout)
Dial in PPFD at 700–900 µmol/m²/s if CO2 is ambient (~400–500 ppm), or push to 900–1,100 µmol/m²/s if enriching to 800–1,000 ppm CO2. Run temperatures at 24–27°C lights on, 20–22°C lights off, with RH 45–50%, targeting a VPD of 1.1–1.3 kPa. Feed a bloom-forward ratio around 1-2-2 or 1-2.5-3 NPK, EC 1.4–1.8, depending on cultivar demand and medium.
Watch for potassium and calcium deficiencies as buds swell; symptoms include marginal chlorosis or necrosis on older leaves (K) and rust spotting on new growth (Ca). Maintain input pH at 6.2–6.6 in soil and 5.8–6.0 in hydro/coco to maximize nutrient availability. Avoid overfeeding autos; many perform best with slightly lower EC than photoperiods at similar stages.
Late Flower and Ripening (Weeks 8–12 from Sprout)
Auto Diesel 47 commonly finishes in 70–85 days, but always confirm maturity by trichomes rather than the calendar. For a balanced effect, harvest when trichomes are predominantly cloudy with 5–15% amber; for a heavier body feel, wait for 20–30% amber. In the final 7–10 days, many growers reduce nitrogen and run a low-EC solution (0.2–0.4) or clear water to minimize residuals.
Lower RH to 42–48% and reduce night temperatures by 2–3°C to enhance color and firmness. Maintain good airflow but avoid directly blasting colas with fans to prevent desiccation. Scent becomes strongest during late ripening; ensure carbon filters are fresh and ducts sealed to control odor.
Mediums, Containers, and Irrigation Strategy
Soil and soilless mixes both work well. In soil, a lightly amended, aerated mix (e.g., peat/coco/perlite at 40/40/20 with organic amendments) provides buffering and flavor depth; in coco or hydro, expect faster growth and potentially higher yields with tighter environmental control. Choose final containers early—7–11 liters for single plants, or 3–5 liters in a high-density sea-of-green (SOG).
Autoflowers dislike transplant shock late in life; if transplanting, move from starter plugs to final containers by day 10–12. Water to light runoff once root mass is established, allowing 10–20% runoff in coco/hydro to prevent salt buildup. Track dry-back: in coco, aim for 10–15% daily dry-back by weight during flower; in soil, irrigate when the top 2–3 cm are dry and the pot feels 50–60% lighter.
Lighting, DLI, and Canopy Management
Under LEDs, target a DLI of 35–45 mol/m²/day in mid-flower for strong yields without light stress. In practice, at 18 hours on, this equates to roughly 540–690 µmol/m²/s PPFD averaged across the canopy; many growers push toward the higher end as CO2 and nutrition allow. Keep lights 30–45 cm above the canopy with even distribution; adjust based on leaf posture and photobleaching signs at the top colas.
Use LST to create 6–10 mains and clear interior growth below the canopy line. A single early top plus tie-downs can add 10–20% to yield in many autos, provided the operations occur before day 21. Avoid aggressive high-stress training after week three to prevent flowering delays and reduced final weight.
Nutrient Benchmarks and Troubleshooting
- pH: Soil 6.2–6.8; Coco/Hydro 5.8–6.2
- EC: Seedling 0.4–0.6; Veg 0.8–1.2; Early flower 1.2–1.5; Mid-late flower 1.4–1.8
- Ca/Mg: 100–150 ppm combined in RO water grows; supplement 1–2 mL/L of CaMg as needed
Common issues include calcium deficiency in LED grows, magnesium demand spikes mid-flower, and potassium hunger during late bulking. If leaf edges burn while new growth pales, reduce EC by 10–20% and increase root-zone oxygenation (e.g., improve drainage, add air stones in DWC). Maintain steady environmental setpoints—fluctuations in RH >10% within a day can reduce terpene retention and stress autos.
Pest and Pathogen Management
Integrated Pest Management (IPM) should start prophylactically. Sticky traps, weekly scouting, and clean intakes reduce pressure from fungus gnats, thrips, and spider mites. Maintain RH and airflow to prevent botrytis; diesel-leaning hybrids with dense colas benefit from precise defoliation and canopy spacing.
Beneficials like predatory mites (Neoseiulus californicus for mites; Amblyseius swirskii for thrips/whitefly) can be released at low rates early in the cycle. Avoid late-stage foliar sprays on autos to prevent residue in trichomes; if needed, use targeted biologicals pre-flower. Sanitize tools and surfaces between cycles to cut reinoculation risk by over 50% in small rooms.
Outdoor and Greenhouse Considerations
Outdoors, Auto Diesel 47 completes fast enough to dodge shoulder-season rains in many temperate zones. Plant in late spring for the strongest sun and aim for 75–85 days to finish; in warm climates, two or even three successive runs per season are feasible. Use 20–30 liter fabric pots with airy media to maximize root volume and speed.
Expect heights of 80–120 cm with strong lateral branching in full sun. Mulch to maintain root moisture and feed lightly but consistently, avoiding high EC spikes during heat waves. Odor can be intense at peak bloom; plan for downwind neighbors accordingly.
Harvest, Drying, and Curing
Harvest when trichomes match your target effect; many growers select 5–15% amber for a classic Diesel balance. Wet trim only minimal leaf if you prefer a slower dry; hang whole plants or large branches at 18–21°C and 58–62% RH for 10–14 days. Once stems snap rather than bend, jar and cure at 58–62% RH, burping daily for the first week and weekly thereafter for 4–6 weeks.
Proper cure increases flavor integration and smoothness; monoterpene preservation is highest when temperatures stay under 21°C and light exposure is minimized. Stored correctly, top-shelf aroma holds for 3–6 months with only gradual decline. Poor storage can flatten citrus notes within weeks, so invest in airtight, UV-protected containers.
Yields and Performance Benchmarks
Indoors, Auto Diesel 47 commonly produces 350–500 g/m² in optimized environments, with experienced cultivators occasionally exceeding 550 g/m². Per-plant yields in 7–11 liter pots typically range 50–150 g under 18–20 hours of high-quality LED light. Outdoors, individual plants can return 60–180 g depending on pot size, sunlight intensity, and nutrition.
Extraction potential is favorable due to resin density and trichome head size. Sift and ice water hash returns vary widely (8–20% of input) based on technique, while solvent-based runs follow the resin richness seen on the plant. Keep in mind that terpene retention, not just cannabinoid yield, defines quality in Diesel-forward cultivars.
Final Notes on Strategy
Because autos run on a biological clock, every decision early in the cycle compounds. Set it up right—final pot, steady environment, early LST, and measured feeding—and Auto Diesel 47 will repay with speed, aroma, and a gleaming frost coat. For first-time auto growers, keep it simple: don’t overwater, avoid late high-stress training, and let the plant ride its schedule.
