C99 Feminized Seeds – G13 Labs · Fast Sativa with Tropical Grapefruit Flavor · High Yield Indoor & Outdoor Cannabis Genetics

C99 feminized seeds by G13 Labs deliver the ultimate "Holy Grail" cannabis experience, combining the soaring, psychoactive high of a pure sativa with the lightning-fast flowering time of an indica.

Growing a premium sativa usually means signing up for a grueling marathon of endless flowering weeks and unmanageable stretching.

You spend months battling towering canopies, stressing over nutrient schedules, and praying that autumn rains won't trigger mold before those airy, fluffy buds finally decide to ripen. It’s a frustrating cycle that leaves you exhausted, draining your resources and testing your patience for a harvest that might not even survive the wait.

With C99, that entire headache disappears because this genetic masterpiece races to the finish line in just 50 to 55 days, rewarding you with massive, dense colas dripping in tropical resin without the typical sativa struggle.

What it feels like to grow and smoke C99

When you spark up C99, the first thing that hits you is an explosion of tropical fruit, sweet grapefruit, and fresh pineapple that coats your palate. It’s a sensory trip that instantly transports you to a sunny beach, leaving a lingering citrusy sweetness that makes every hit incredibly smooth and flavorful.

The high kicks in almost immediately with a clear, psychoactive rush that sparks creativity and uplifts your mood. You'll feel a surge of euphoric energy that makes you want to get things done or just vibe out with friends. But the real magic happens as the experience progresses; that cerebral buzz gently melts into a deeply relaxing physical stone, wiping away the stress of a rough day without locking you to the couch.

In the grow room, this strain makes you feel like an absolute pro. Watching it stack dense, frosty buds at breakneck speed gives you a massive sense of pride and confidence. It’s a vigorous, forgiving plant that takes the anxiety out of cultivation, letting you enjoy the process and anticipate a top-tier harvest with zero drama.

How to squeeze the experience to the max

To get the absolute most out of this tropical powerhouse, you need to play to its strengths.

• Time your sessions: Enjoy it in the late afternoon when you want to transition from a productive day into a chill, relaxed evening.
• Boost the terpenes: Keep your late-flowering temperatures slightly cooler to bring out those intense grapefruit and pineapple aromas.
• Support the heavy branches: Use stakes or a trellis net early on, as the massive colas will need help staying upright during the final weeks.
• Dial in the cure: Give the buds a slow, steady cure in glass jars for at least three weeks to smooth out the smoke and maximize the exotic flavor profile.
• Pair it with creativity: Keep a sketchbook, an instrument, or a good playlist nearby, as the initial high is incredibly inspiring.

Advantages and benefits in your day-to-day life

• Because it flowers in just 50-55 days, you can harvest top-shelf sativa buds weeks earlier than usual, which means less waiting and more enjoying.
• Thanks to its balanced 12-15% THC content, you get a highly enjoyable, functional buzz, allowing you to stay social and active without overwhelming anxiety.
• With its robust Jack Herer x Haze genetics, the plant shows incredible vigor and resilience, meaning you spend less time stressing over plant health and more time admiring your canopy.
• Because of its massive yield potential, you secure a heavy stash of premium flowers, saving you money and keeping your jars full for months.
• Thanks to its exotic tropical terpene profile, every session feels like a premium tasting experience, elevating your daily ritual into something truly special.

How it fits with other products in your set-up

C99 is a versatile beast that thrives in almost any environment, but it truly shines when paired with organic nutrients that enhance its natural terpene profile. If you are running a living soil setup or using carbohydrate boosters, you will notice a massive explosion in its sweet, fruity aromas.

Because it grows with a prominent main stem and medium internodal spacing, it’s a perfect candidate for Sea of Green (SOG) setups. You can easily pack multiple plants into a tight space, maximizing your yield per square meter while keeping the canopy even and manageable.

Technical specifications

• Breeder / Brand: G13 Labs
• Type: Feminized photoperiod
• Dominance: Sativa dominant (~75%)
• Genetics / Cross: Jack Herer × Haze
• Flowering time (Indoor): 50–55 days
• Harvest (Outdoor): End of September / Early October (Northern Hemisphere)
• Yield (Indoor): Up to 500 g/m² (1.64 oz/ft²)
• Yield (Outdoor): Up to 750 g/plant (26.46 oz/plant)
• Height (Indoor): 0.80–1.20 m (2.62–3.94 ft) approx.
• Height (Outdoor): 2.00–3.00 m (6.56–9.84 ft) approx.
• Difficulty: Low
• Structure and vigour: Prominent main stem, medium internodal distance, excellent leaf-to-calyx ratio.
• Ideal climate: Temperate, Mediterranean, or controlled indoor environments.
• Recommended pot: 11–20 L (2.91–5.28 gal) depending on space.
• Smell in grow: High (carbon filter highly recommended).
• THC: 12–15%
• CBD: Low
• Aromatic profile: Citrusy, tropical, grapefruit, pineapple.
• Flavour: Exotic, sweet, and fruity.
• Effect: Psychoactive and uplifting start, finishing with deep physical relaxation.

Stages and monitoring of C99

Quick overview: Photoperiod · G13 Labs · ~90 days total cycle approx. · Ideal for SOG setups.

• Sativa dominance but grows with indica-like speed.
• Highly forgiving genetics, perfect for beginners.
• Thrives in both soil and coco coir.

Safe start: Germinate at 22–25 °C (71–77 °F) and keep humidity high for rapid taproot emergence.

• Use Root Riot Sponges to speed up rooting and reduce transplant stress.
• Maintain 60–70% RH during the seedling stage.
• Water sparingly to encourage roots to search for moisture.

Directed growth: Run an 18/6 light cycle and keep temperatures around 22–26 °C (71–79 °F).

• Top early if you want a bushier structure.
• Keep EC progressive to avoid nutrient burn.
• Ensure good airflow to strengthen the main stem.

Efficient flowering: Switch to 12/12 and watch for rapid bud development over 50–55 days.

• Lower humidity to 40–50% to prevent mold in dense colas.
• Add Top Candy during peak bloom for denser, sweeter buds.
• Support heavy branches as harvest approaches.

Harvest and refinement: Flush thoroughly and chop when trichomes are mostly cloudy for an uplifting high.

• Dry slowly at 18–22 °C (64–71 °F) and 50–60% RH.
• Cure for 3–4 weeks to unlock the tropical grapefruit flavor.
• Trim carefully to preserve the excellent leaf-to-calyx ratio.

Frequently Asked Questions

Is C99 a good strain for beginners?

Absolutely. Despite being a premium sativa-dominant hybrid, it is incredibly forgiving, highly resistant to common mistakes, and finishes flowering very quickly, making it an excellent choice for novice growers.

How long does C99 take to flower indoors?

This strain is famous for its speed. Once you switch your lights to a 12/12 schedule, it only needs about 50 to 55 days to reach full maturity and be ready for harvest.

What kind of effects can I expect from C99?

You will experience a beautifully balanced high. It starts with a clear, uplifting, and psychoactive cerebral buzz that sparks creativity, and eventually transitions into a soothing, physical relaxation that won't leave you couch-locked.

Does C99 smell strong during cultivation?

Yes, it develops a very intense, sweet, and tropical aroma as it flowers. Using a high-quality carbon filter in your indoor setup is highly recommended to keep the citrusy, grapefruit scents under control.

Personal Experience of Pevgrow’s CEO (Alan)

Whenever I want a top-tier sativa without the agonizing wait, C99 is my absolute go-to. I usually run it in a Sea of Green setup because that prominent main cola just stacks beautifully. The first time I grew it, I was blown away by how fast it finished—barely 8 weeks of flowering and the buds were rock-hard and dripping with resin. If I didn't have this strain in my rotation, I'd probably avoid sativas altogether just to save time. The high is incredibly clean; I love vaping it on a Sunday afternoon when I want to stay active but still feel that deep, satisfying chill. One trick I’ve learned: drop the nighttime temperatures by a few degrees during the last two weeks of flowering. It forces the plant to push out even more of those insane tropical grapefruit terpenes, making the final flavor absolutely mind-blowing.