Underdawg OG Feminized Seeds – TH Seeds · Heavy-Yielding Kush & Diesel Hybrid

Underdawg OG by TH Seeds is a premium feminized cannabis seed that brings the legendary power of the Chemdawg family straight to your grow room, delivering massive, resin-drenched buds with an unmistakable diesel and lemon punch.

Are you tired of growing finicky Kush strains that promise the world but end up delivering tiny, airy buds and a weak aroma?

Spending months carefully nurturing your plants only to harvest a mediocre yield is incredibly frustrating. When you invest your time, energy, and electricity, you want dense, sticky flowers that reek of that classic gas and earth, not a forgettable harvest that leaves your stash jars half empty.

Underdawg OG is the ultimate answer for growers who demand both quality and quantity. By crossing OG Kush with Sour Diesel, TH Seeds has created a robust, easy-to-grow hybrid that guarantees heavy yields of frosty, pungent nugs, giving you that authentic top-shelf experience without the typical cultivation headaches.

A Heavy-Hitting Kush Experience for Your Day-to-Day

When you crack open a jar of Underdawg OG, the room instantly fills with a sharp, metallic diesel aroma layered with fresh lemon and earthy undertones. It is a sensory trip that takes you back to the golden era of West Coast genetics. Whether you prefer to roll up after a long day or pack your vaporizer for a flavor-chasing session, this strain delivers a thick, satisfying smoke that coats your palate.

The effects are just as impressive as the flavor. Thanks to its 60% Indica dominance, it provides a deeply relaxing body stone that melts away physical tension. However, the 40% Sativa influence ensures your mind stays happy, uplifted, and surprisingly creative. It is the perfect companion for a chilled evening at home, listening to music, or brainstorming your next big project without feeling completely glued to the couch.

Technical specifications

• Breeder: TH Seeds
• Type: Feminized photoperiod
• Dominance: 60% Indica / 40% Sativa
• Genetics: OG Kush × Sour Diesel
• Flowering (Indoor): 8–9 weeks
• Harvest (Outdoor): Mid-October (Northern Hemisphere) / Mid-April (Southern Hemisphere)
• Yield (Indoor): 400–450 g/m² (1.31–1.48 oz/ft²)
• Yield (Outdoor): Up to 1 kg/plant (2.20 lb/plant)
• Height (Indoor): 1.20–1.40 m (3.94–4.59 ft)
• Height (Outdoor): 2.00–2.50 m (6.56–8.20 ft) approx.
• Difficulty: Medium
• Aromatic profile: Diesel, lemon, earthy, pungent Kush notes
• Effect: Relaxed, happy, uplifting, creative
• THC: 20–24% approx.

How to grow Underdawg OG efficiently

Follow these simple steps to get the absolute most out of this vigorous Chemdawg descendant.

1. Preparation and Start: Begin with a solid foundation to ensure vigorous early growth and strong roots.
   • Germinate seeds at 22–25 °C with high humidity.
   • Plant in a light, airy soil mix to prevent waterlogging.
   • Use Light Mix Peat Free BioBizz 50L for an organic start.
   • Keep the seedling under an 18/6 light schedule.
2. Vegetative Stage: Guide the plant's structure to maximize light penetration and future bud sites.
   • Maintain temperatures around 22–26 °C.
   • Apply LST to control its 1.20–1.40 m (3.94–4.59 ft) indoor height.
   • Feed with a quality nitrogen-rich base nutrient.
   • Ensure good airflow to strengthen branches.
3. Flowering Phase: Switch to 12/12 and watch the magic happen over 8–9 weeks.
   • Lower humidity to 40–50% to prevent mold in dense buds.
   • Add Bud Ignitor® by Advanced Nutrients for explosive flowering.
   • Support heavy branches as the frosty Kush nugs pack on weight.
   • Keep temperatures between 20–25 °C.
4. Harvest and Curing: Maximize the diesel and lemon terpene profile with a proper finish.
   • Flush the substrate 10 days before harvest for a cleaner taste.
   • Chop when trichomes are mostly milky with some amber.
   • Dry slowly at 18–22 °C for 10–14 days.
   • Cure in glass jars for at least 3 weeks to enhance flavor.

Key advantages and benefits of Underdawg OG

• OG Kush x Sour Diesel genetics: You get the absolute best traits from two legendary Chemdawg descendants, which means you enjoy a highly stable, vigorous plant with top-tier potency.
• Heavy resin production: The flowers become completely coated in a thick layer of trichomes, making this strain an outstanding choice if you love making your own hash or rosin extracts.
• 60% Indica / 40% Sativa ratio: It provides a perfectly balanced physical and mental high, allowing you to unwind and relax your body while keeping your mind sharp and creative.
• Massive outdoor yield potential: Under optimal conditions, it can produce up to 1 kg (2.20 lb) per plant, ensuring your stash jars stay full throughout the entire winter.
• Pungent terpene profile: The intense blend of diesel, earth, and lemon translates into a thick, flavorful smoke that satisfies even the most demanding Kush connoisseurs.

Care and maintenance tips

Underdawg OG is a robust plant, but its dense, frosty buds require a bit of attention during the late flowering stage. Because the flowers get so thick and heavy, it is crucial to maintain excellent ventilation in your grow tent. Keep your relative humidity strictly between 40% and 50% during the final weeks to prevent any risk of botrytis (bud rot) ruining your precious harvest.

Additionally, this strain loves a good feeding schedule but can be sensitive to nutrient lockout if you overdo it. Always monitor your pH and EC levels closely, using a reliable product like pH Down Powder Dry to keep your nutrient solution perfectly balanced.

• Use bamboo stakes or a SCROG net to support the heavy branches.
• Defoliate large fan leaves blocking light to lower bud sites.
• Use a high-quality carbon filter; the diesel aroma is extremely pungent.
• Store your cured buds in airtight glass jars in a cool, dark place.

Frequently Asked Questions

How long does Underdawg OG take to flower?

Indoors, this strain has a relatively fast flowering time of just 8 to 9 weeks (60-65 days) after switching the light cycle to 12/12. Outdoors, it is usually ready to harvest by mid-October in the Northern Hemisphere.

Is this strain suitable for beginners?

Yes, it is moderately easy to grow. While it thrives in the hands of experienced growers who can maximize its yield, its robust Chemdawg lineage makes it forgiving enough for beginners who maintain basic environmental controls.

What does Underdawg OG taste like?

It boasts a classic, old-school flavor profile dominated by sharp diesel and fuel notes, complemented by earthy undertones and a refreshing hint of citrusy lemon on the exhale.

How tall does it grow indoors?

Indoors, it typically reaches a height of 1.20 to 1.40 m (3.94 to 4.59 ft). We recommend using training techniques like LST or topping to keep the canopy even and maximize light distribution.

Personal Experience of Pevgrow’s CEO (Alan)

The first time I popped a pack of Underdawg OG, I knew TH Seeds had captured lightning in a bottle. I have always been a massive fan of the Chemdawg family, but finding a cut that yields this heavily without sacrificing that authentic, lung-expanding gas flavor is rare. I ran these in a standard soil setup, and by week 6 of flower, the carbon filter was working overtime. The buds stacked up beautifully, dense and sticky like glue.

What I love most about this strain is the high. It hits you right behind the eyes with a wave of euphoria, then slowly melts down into your shoulders. It is my go-to smoke for a Sunday afternoon when I want to chill out but still have the mental clarity to read or play some video games. My biggest tip? Do not skip the flush. Give it a solid 10 days of pure water at the end, and that lemon-diesel terpene profile will absolutely sing in your vaporizer.