BCN Critical XXL Fast Feminized Seeds – Seed Stockers | High-Yielding Indica Hybrid, Citrus Flavor & 23% THC

BCN Critical XXL Fast by Seed Stockers is a high-yielding, fast-flowering feminized cannabis seed that delivers massive harvests and a powerful 23% THC punch, all wrapped in a fresh citrus flavor profile.

Are you tired of waiting forever for your plants to finish flowering?

Long flowering times mean more electricity, more risk, and more stress — especially if you're working with limited space or a tight schedule. Waiting 10+ weeks just to see results can kill your momentum and drain your wallet.

What if your plant took forever but still underperformed?

Imagine putting in months of work only to harvest small, airy buds with weak effects. That frustration — when effort doesn’t match reward — is real. You end up wasting time, nutrients, and energy on a strain that just doesn’t deliver. And let’s be honest: nobody wants to smoke something that disappears in one hit… unless it’s *supposed* to.

BCN Critical XXL Fast gives you big yields in record time — without sacrificing quality

This feminized powerhouse combines genetics from Kritikal Bilbo, Critical +, and Critical Mass to deliver a plant that grows fast, flowers fast (50–55 days), and produces dense, resin-coated buds with a bright citrus aroma. With THC up to 23%, you get a strong, long-lasting body high that pins you to the couch — perfect for unwinding at night. Indoors, expect up to 600 g/m²; outdoors, plants can exceed 1 kg under optimal conditions.

What this strain brings to your growing experience

You’re not just growing a plant — you’re investing in reliability and performance. BCN Critical XXL Fast thrives in both indoor and outdoor setups, adapting easily to soil, coco, or hydro systems. Its pyramidal structure makes it ideal for SCROG or SOG techniques, giving you maximum control over yield and light exposure. Whether you're a beginner or a seasoned grower, this strain simplifies success: fast turnaround, high resistance to pests, and minimal training needed.

Fast flowering, big harvests, consistent results

Thanks to its photoperiod feminized nature and optimized genetics, this strain finishes flowering in just 50–55 days — faster than most traditional Criticals. That means quicker turnover, less energy consumption, and more harvests per year.

• Indoor flowering period: 50–55 days (faster than average)
• Outdoor harvest: late September (H.N.) / late March (H.S.)
• Indoor yield: up to 600 g/m² (21.17 oz/ft²)
• Outdoor yield: over 1000 g/plant (35.27 oz/plant)
• Plant height: up to 3 m (9.84 ft) outdoors with space
• THC content: up to 23% — strong, narcotic effect
• Flavor: fresh citrus with lemon notes — dangerously smooth smoke

Maximize your yield and efficiency without overspending

BCN Critical XXL Fast isn’t just about speed — it’s about smart growing. You get premium genetics at a fair price, with returns that far outweigh the initial investment. Here’s how to make the most of it:

• Use 9 L pots indoors for optimal root development
• Train with LST or SCROG to maximize light penetration
• Install a carbon filter — this plant smells strong
• Prevent mold in late flowering with proper airflow
• Harvest when trichomes turn milky to amber for full effect

Pro tips to get the most out of BCN Critical XXL Fast

For best results, start with high-quality germination tools and maintain stable conditions throughout the cycle. Avoid overwatering during flowering and flush 7–10 days before harvest for a cleaner taste. If you're growing indoors, a Micro Kit Ata Terra can help balance soil microbiology from the start. During flowering, adding a bloom booster like HESI Hydro Bloom enhances resin production. Outdoors, use Bio Bav Problem Solver to protect against fungi in humid climates.

Technical specifications

• Breeder / Brand: Seed Stockers
• Type: Feminized
• Dominance: Indica-dominant hybrid (~60% indica)
• Genetics: Kritikal Bilbo × Critical + × Critical Mass
• Indoor flowering: 50–55 days
• Outdoor harvest (H.N.): Late September
• Outdoor harvest (H.S.): Late March
• Indoor yield: Up to 600 g/m² (21.17 oz/ft²)
• Outdoor yield: Over 1000 g/plant (35.27 oz/plant)
• Indoor height: 80–110 cm (2.62–3.61 ft)
• Outdoor height: Up to 3 m (9.84 ft)
• THC: Up to 23%
• CBD: Low (approx. 0.5%)
• Difficulty: Low to medium
• Structure: Pyramidal, branched, vigorous
• Climate: Mediterranean, temperate
• Resistance: Good resistance to pests; moderate to fungi
• Training: Suitable for LST, SCROG, SOG
• Smell during grow: High — carbon filter recommended
• Flavor: Citrus, lemon, fresh
• Effect: Strong body relaxation, mental fog, long-lasting — ideal for nighttime use

How to grow BCN Critical XXL Fast – Expert grow guide

Quick overview: feminized photoperiod strain from Seed Stockers, 50–55 day flowering, low to medium difficulty, ideal for indoor and outdoor in Mediterranean climates.

Safe start
Get germination right and set strong roots early.

• Germinate seeds in moist paper towels at 22–25 °C
• Transplant carefully when radicle reaches ~1 cm
• Use well-aerated soil or coco to prevent damping off
• Apply Root It 150ml to boost root development

Stable seedling
Establish healthy growth with proper light and hydration.

• Provide 18/6 light cycle with moderate intensity
• Water lightly when topsoil feels dry
• Maintain RH at 60–70% and 22–26 °C
• Inoculate with mycorrhizae for stronger uptake

Directed growth
Shape your plant for maximum yield and control.

• Switch to 18/6 during veg, then 12/12 to flower
• Use 9 L pots indoors for optimal size
• Apply LST early to create even canopy
• Feed with balanced nutrients like Bio Bloom BioBizz

Efficient flowering
Maximize bud density and resin production.

• Lower RH to 40–50% in mid to late flowering
• Ensure strong airflow to prevent mold
• Add bloom boosters like Heavy Bud Pro Grotek at peak flowering
• Monitor trichomes: harvest when milky to amber

Harvest, drying and curing
Finish strong for premium-quality buds.

• Flush with plain water 7–10 days before harvest
• Dry at 18–22 °C and 50–60% RH for 7–10 days
• Cure in glass jars for 2–4 weeks, burping daily
• Store in a cool, dark place to preserve terpenes

Frequently Asked Questions

How long does BCN Critical XXL Fast take to flower?

Indoors, it flowers in 50–55 days. Outdoors, it’s ready by late September in the northern hemisphere.

Is BCN Critical XXL Fast good for beginners?

Yes, it’s easy to grow with low to medium difficulty. It handles mistakes well and doesn’t require advanced techniques.

How much yield can I expect outdoors?

With proper care, you can harvest over 1000 g (35.27 oz) per plant outdoors under optimal conditions.

Does this strain need a lot of nutrients?

No, it performs well with moderate feeding. Overfeeding can lead to nutrient burn, especially in flowering.

Why does this plant smell so strong?

Its citrus-dominant terpene profile produces a powerful aroma. Use a carbon filter indoors to control odor.

Personal Experience of Pevgrow’s CEO (Alan)

I’ve grown a lot of Criticals in my time, but BCN Critical XXL Fast stands out because it actually lives up to the hype. I ran it in a Mammoth Elite tent with 11 plants in 9 L pots — all under 600W LED. Flowering took just 52 days, and I pulled just under 600 g/m². The buds were rock-hard, covered in resin, and smelled like fresh lemons. I shared some with friends and one said, “I didn’t feel my legs for three hours.” That’s the kind of effect you get. I’d grow this again in a heartbeat — especially for commercial SOG setups. My only tip? Don’t skip the carbon filter. This thing reeks in week 6.