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Sour Diesel Auto: Fuel on Fast-Forward
If you want that classic sour fuel without the long wait, Sour Diesel Auto brings the punch in a compact, quick-finishing package. Same legendary flavour and energy, shrunk into an easy, stealth-friendly run for Aussie tents and balconies.
Quick Stats
Sour Diesel Auto is a sativa-leaning hybrid (~65/35) bred from Sour Diesel × Ruderalis. She hits 18–22% THC, finishes in 10–11 weeks seed-to-harvest, and yields about 400–500 g/m² indoors or 70–120 g/plant outdoors. Matty’s tip: “Small frame, big stink. Don’t sleep on odour control.”
The Legend
Sour Diesel has ruled since the 90s for one reason: LOUD fuel terps and buzzing, happy energy. This auto version keeps the sour-citrus diesel you know, swaps light-schedule hassle for speed, and still stacks sticky, day-starter buds.
Flavour & Aroma
On the nose: Petrol first, sharp citrus peel behind it. On the tongue: Sour funk, earthy citrus, and a lingering diesel finish that coats the palate.
Matty’s Take: “Smells like a jerry can in a lemon grove. Proper old-school Sour D.”
Effects & What to Expect
First wave → Fast, buzzy lift. Then it settles → Clear focus and chatty vibes. Final vibe → Uplifting, giggly, and very daytime. Naps not included.
How I Grow It (Matty’s Way)
Skill Level: Beginner–Intermediate.
Autos hate delays. Plant in the final pot (11–18 L), run 18/6 light, and keep stress at zero. Stick to LST only — no topping, no HST. Outdoors, full sun and a breeze. Autumn humidity? Dehu or extra airflow from week 7.
Matty’s pH Know-How: Soil 6.0–6.5; coco/hydro 5.8–6.2. Consistent pH = louder terps and smoother run.
📅 Grow Log: Inside the Tent
| Phase/Week | Key Action/Status | Matty’s Tip |
|---|---|---|
| Week 1 (Sprout) | Quick pop; can stretch. | Lower light distance; gentle watering only. |
| Weeks 2–3 (Early Veg) | Compact bush forms. | LST the mains; no topping. Set your final humidities now. |
| Weeks 4–6 (Flower Onset) | Pistils everywhere, smell ramps. | Carbon filter on; keep VPD tight to avoid foxtails. |
| Weeks 7–9 (Bulk) | Frost and weight stack fast. | RH ~45%; keep leaves off each other for airflow. |
| Weeks 10–11 (Finish) | Cloudy trichs, amber flecks. | Chop at ~10% amber for max flavour + pop. |
🔬 Matty’s Advanced Notes (For the Nerds)
- Terpenes: Limonene • Myrcene • Caryophyllene (diesel-citrus over earth/spice).
- VPD: Veg/early flower ~0.9–1.1 kPa; mid/late flower ~1.0–1.2 kPa.
- Feeding: Medium-light appetite. Peak bloom EC ~1.4–1.8; avoid big jumps.
- Training: LST only; defoliate lightly in week 5 if leaves blanket bud sites.
- Climate: 22–27 °C day / 18–20 °C night; RH ≤45% late flower.
- Air Management: LOUD by week 4. Oversize the filter by 20–30%.
- Red Flag: Overwatering weeks 1–3 = permanent stunt. Let the pot lighten between feeds.
Matty’s Note: “Proof autos can wear the Sour D crown. Small plant, massive personality.”
🚫 Mythbusting
Myth: “Autos are weak.”
Truth (Matty): She still hits 22% THC. Lightweight she ain’t.
Myth: “Fuel terps don’t translate to autos.”
Truth (Matty): This one reeks — in the best way.
Myth: “Autos can’t yield.”
Truth (Matty): 400–500 g/m² is very real with timing and airflow.
🎯 Who It’s For?
Perfect for:
- Daytime smokers who want energy and focus.
- Fans of classic sour-diesel flavour in a fast run.
- Stealth and balcony grows needing speed and size control.
Not ideal for:
- Couch-lock hunters.
- Setups without odour control.
🏆 Final Verdict
Matty’s Final Word: “Sour Diesel Auto is a proper throwback turned sprint. All the sour funk, all the daylift, none of the faff. If you want fast fuel, this is the one.” ⛽⚡
Ready to Grow?
Level up your run: Start strong with our Germination Guide, fix issues fast with Leaf Forensics, and dial feeds via the Nutrients Guide.
Great business!