Sour Petroleum Feminized Seeds – Dr Underground | Diesel-Citrus Hybrid for High-Yield Indoor & Outdoor Grows

Sour Petroleum Feminized Seeds from Dr Underground deliver a high-octane hybrid experience, blending explosive citrus-diesel flavor with serious potency and top-shelf yields—ideal for growers who want a standout sativa-leaning strain that performs under pressure.

Does your current strain fall flat when you need energy, focus, or a burst of creativity? You’ve tried the classics, but they either burn you out or don’t hit hard enough. You’re not alone—many growers settle for average genetics that look good on paper but underdeliver in flavor, effect, and yield.

That frustration builds: wasted time, weak harvests, and joints that don’t spark joy. You start questioning whether it’s worth the effort—especially when you’re investing in lights, nutrients, and space. The last thing you want is another forgettable smoke that disappears into the background.

Meet Sour Petroleum—a limited-run powerhouse from Dr Underground that’s engineered to dominate. With a lineage rooted in Chemdog, Super Skunk, and Northern Lights, this 70% sativa hybrid delivers a euphoric, uplifting high and a complex aroma profile that evolves with every puff. It’s built for performance: expect dense, emerald-green buds coated in trichomes, indoor yields up to 600 g/m² (21.19 oz/ft²), and a flowering time of just 9 weeks. Whether you're chasing daytime inspiration or a flavorful wind-down, Sour Petroleum adapts to your rhythm—no compromises.

What Makes Sour Petroleum Stand Out

Bred for connoisseurs and cultivators who demand more, Sour Petroleum combines legendary genetics into a modern, high-yield machine. Its 30% indica structure keeps the high grounded, while the dominant sativa spark ignites focus and sociability. With THC levels between 20–25%, it’s not for beginners—but if you’re ready to level up, this strain delivers.

Explosive Flavor and Aroma Profile

Sour Petroleum hits the nose with a punch of diesel and earth, softened by bright citrus and pine. On the exhale, a sweet, spicy kick lingers—like old-school skunk with a gourmet twist. The terpene profile, rich in myrcene, limonene, and pinene, supports a flavor that’s bold, complex, and unforgettable. Perfect for rolling, vaping, or curing into premium flower.

High-Yield Growth for Advanced Cultivators

• Indoor yield: 500–600 g/m² (17.64–21.19 oz/ft²)
• Outdoor yield: 250–300 g/plant (8.82–10.58 oz/plant)
• Flowering time: 8–10 weeks (56–69 days)
• Indoor height: 0.90–1.20 m (2.95–3.94 ft)
• Outdoor height: 1.20–1.50 m (3.94–4.92 ft)
• THC: 20–25% | CBD: 0–1%
• Difficulty: Advanced (not recommended for beginners)

Technical specifications

• Breeder / Brand: Dr Underground
• Type: Feminized photoperiod
• Dominance: 70% sativa, 30% indica
• Genetics: Chemdog × Super Skunk × Northern Lights
• Flowering time: 8–10 weeks (56–69 days)
• Indoor yield: 500–600 g/m² (17.64–21.19 oz/ft²)
• Outdoor yield: 250–300 g/plant (8.82–10.58 oz/plant)
• Indoor height: 0.90–1.20 m (2.95–3.94 ft)
• Outdoor height: 1.20–1.50 m (3.94–4.92 ft)
• THC: 20–25%
• CBD: 0–1%
• Difficulty: Advanced
• Structure: Compact, dense branching
• Climate: Temperate, Mediterranean
• Resistance: Moderate resistance to mold and pests
• Training: Suitable for LST and SCROG (avoid aggressive pruning)
• Recommended pot: 11–20 L (soil or coco with good aeration)
• Light cycle: 18/6 (veg), 12/12 (flowering)
• Temperature: 22–26 °C (veg), 20–25 °C (flowering)
• Humidity: 60–70% (seedling), 50–60% (veg), 40–50% (flowering)
• pH: 6.0–6.5 (soil), 5.8–6.2 (coco/hydro)
• Smell in grow: High – use a carbon filter
• Aromatic profile: Diesel, citrus, pine, earth, sweet spice
• Effect: Uplifting, euphoric, creative – ideal for daytime or social use

How to Grow Sour Petroleum for Maximum Results

Designed for experienced growers, Sour Petroleum rewards attention to detail with massive, resinous yields. Here’s how to get the most out of this limited-edition strain.

Quick overview: feminized photoperiod from Dr Underground · 8–10 week flowering · advanced difficulty · ideal for indoor SCROG or outdoor stealth grows in warm climates.

Safe start: germinate in a moist, dark environment at 22–25 °C. Transplant carefully once the taproot reaches ~1 cm (0.39 in). To boost early root strength, SeedBooster Plus germination stimulator helps seedlings establish faster and with less stress.

Stable seedling: keep humidity at 60–70% and provide gentle light. Use a well-aerated soil mix and avoid overwatering. Introducing Mega Worm at this stage enriches the soil with natural microbes and improves nutrient uptake.

Directed growth: switch to 18/6 light cycle and increase intensity. Train with LST or SCROG to maximize light exposure. Maintain pH 6.0–6.5 and feed progressively. For sustained vigor without stretch, Voodoo Juice Advanced Nutrients supports robust root development and stress resistance.

Efficient flowering: flip to 12/12 and reduce humidity to 40–50%. Support heavy colas with stakes. Boost resin production mid-flower with PK-rich additives. Monitor trichomes—harvest when milky with slight amber for balanced effects.

Harvest and refinement: flush 7–10 days before harvest. Dry slowly at 18–22 °C (64–72 °F) and 50–60% RH. Cure in glass jars for 2–4 weeks to enhance flavor and smoothness.

Frequently Asked Questions

Is Sour Petroleum good for beginners?

No, this strain is recommended for advanced growers due to its sensitivity to nutrients, humidity, and training techniques. Beginners may struggle with mold control and overfeeding.

What does Sour Petroleum smell like when growing?

It has a strong, pungent aroma—diesel, skunk, and citrus—so a carbon filter is highly recommended, especially for indoor grows.

Can I grow Sour Petroleum outdoors in a colder climate?

It thrives in warm, Mediterranean-like climates. In cooler regions, grow in a greenhouse or choose a shorter-season strain.

How much yield can I expect per plant outdoors?

Each plant can produce 250–300 g (8.82–10.58 oz), depending on care, sunlight, and soil quality.

Does it require special nutrients?

No, but it responds well to balanced feeding. Use a quality base nutrient like DualPart Bloom and supplement with bloom boosters during flowering.

Personal Experience of Pevgrow’s CEO (Alan)

I grew Sour Petroleum last season in my 1.2 x 1.2 m (4 x 4 ft) SCROG setup under a 600W LED. From day one, it showed aggressive growth—tight internodes, thick stems, and a smell that punched through my carbon filter by week 3. I used LST early to create an even canopy, then switched to 12/12 at 45 cm (17.72 in). The stretch was moderate, and by mid-flower, the buds were dense and glistening. I fed with a coco-based regimen and added Voodoo Juice and SensiZym throughout. At 67 days, trichomes were milky with a hint of amber—I flushed for 10 days and dried slowly. The result? Just under 580 g (20.46 oz) of frosty, aromatic flower. The high is fast-hitting and cerebral, perfect for writing or hanging with friends. Not for the faint-hearted, but if you know what you’re doing, it’s one of the most rewarding grows I’ve had this year.