BCN Critical XXL Seeds

bcn critical xxl seeds

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BCN Critical XXL – Strain ID:

bcn critical seeds

Type: Hybrid
Cannabinoids: 26% THC (avg)
Terpenes: Myrcene, Limonene, Pinene
Effects: Balanced Chill High
Landrace Strain: Kritical Bilbo x Critical Mass

Grow Difficulty: Easy
Harvest: 8-9 Weeks
Yield: 600 g/m2 / 1kg per plant
Height: Up to 100 cm
(*Indoor / *Outdoor)

BCN Critical XXL is a genetic masterpiece known for producing massive yields, heavy trichome-covered buds, and a gloriously balanced high. The Indica-Sativa hybrid strain is the brainchild of Seedstockers, a collective with a reputation for breeding some of the most impressive varieties in the modern era. In this article, we’ll cover everything you need to know about BCN Critical XXL seeds, including where to buy them, cultivation tips, and an in-depth strain review you won’t find anywhere online.

About BCN Critical XXL Seeds


The Spanish-based seed bank, Seedstockers, has another incredible strain on its hands with BCN Critical XXL. Critical genetics is already a favorite among cannabis enthusiasts around the world, but thanks to highly advanced selective breeding, the family has been upgraded.

Breeders at Seedstockers birthed this masterpiece using premium Basque country clones of Kritical Bilbo and Critical +, then crossed again with Critical Mass. The result is a low-maintained strain with an unparalleled high, distinct citrus flavor, and big fat nugs.

BCN Critical XXL strain is truly a genetic phenomenon and a testament to the evolution of cannabis breeding. Once you experience the onslaught of perfectly balanced effects, you’ll know exactly what we’re talking about.

How to Grow BCN Critical XXL Seeds

Growing BCN Critical XXL seeds is a relatively easy process that can be highly rewarding for novice and veteran cultivators. While the plants’ robust genetic profile makes them adaptive to adverse environmental factors and resilient to pests, disease, and mold, we strongly recommend following our tips to ensure you experience the maximum potential of the strain.

In this section of our BCN Critical XXL review, we’ll cover essential growing tips to help you curate the optimal environment for your plants. In addition, we’ll set the expectations regarding flowering time, yield, and height so you won’t run into any surprises during the process.

Grow Difficulty

BCN Critical XXL feminized seeds are easy to grow and will flourish with little attention to detail. That is the gift and the curse of highly optimized cannabis genetics; you can get away with doing the bare minimum and still produce high-quality buds. However, if you want to truly experience the height of the Critical family and all its glory, including the crisp citrus aroma, an array of exotic colors, and unmatched hybrid effects, you’ll want to follow our cultivation tips.

Optimal Growing Conditions and Climate

Putting in a little work goes a long way with BCN Critical. Optimize your grow environment for temperature, humidity, pH, and lighting for maximum yields and cannabinoid production.


BCN Critical XXL plants prefer a warm and consistent temperature range between 20-26°C (68-79°F) during the vegetative stage. During the flowering stage, adjust to being slightly cooler, between 18-24°C (64-75°F); this helps prevent heat stress and encourages the development of the strain’s iconic, oversized, dense buds.

We highly recommend keeping your indoor grow room below 32°C (90°F) as higher temperatures can cause damage to the plant’s structure and lead to reduced yields.


Maintaining a proper level of humidity is crucial for the growth and development of BCN Critical XXL plants. Aim for a humidity level of around 65% during the vegetative stage. However, we recommend keeping humidity levels below 65% during flowering to prevent mold and mildew.

pH Balance

The pH balance of the soil or hydroponic system is critical for the successful growth of BCN Critical XXL plants. When growing hydroponically, maintain a pH level of 5.5 to ensure the plant can absorb nutrients efficiently. A pH level that is too high or too low can lead to nutrient deficiencies, stunted growth, and reduced yield.


BCN Critical XXL plants require strong lighting to produce large, dense nugs. Therefore, we recommend using at least a 600W HID lamp to provide the necessary light intensity for the plant’s growth.

During the vegetative stage, a schedule of 18 hours of light and 6 hours of darkness each day. When the plant is ready for flowering, switch your light schedule to 12 hours of light and 12 hours of darkness.

Flowering Time

If growing indoors, you can expect your BCN Critical XXL seeds to flower around 8-9 weeks. The plants will likely flower in late September or early October if they are outside.

Remember that flowering times vary due to environmental factors, and ensure your plants are fully developed through veg before changing your lighting schedule. Forcing plants to flower too early will significantly impact your yield and quality of buds.


Yield also depends on the time and care you put into your plants. Assuming you’ve followed our tips for optimizing your grow environment, you can expect 600 grams per square meter indoors and a whopping kilogram per plant outdoors.


BCN Critical XXL plants typically grow to a medium height of around 100-120cm indoors. Outdoors grows with plenty of light and more room to expand will likely lead to taller plants.

If you are growing inside, BCN Critical XXL delivers a significant advantage over other strains. In addition, the natural compact structure allows for discretion and efficient use of space if your grow room is limited. As a result, we recommend utilizing the Sea of Green growing method to encourage development and maximize production.

How to use Sea of Green with BCN Critical XXL Cannabis

The Sea of Green (SOG) growing method is a technique used to grow cannabis plants in a way that maximizes the use of space and increases yield. SOG aims to have many small plants growing closely together and all at the same stage of maturity so that they can utilize space efficiently and produce buds quickly.

Follow this brief guide to SOG to maximize your BCN Critical XXL seeds:

1. Position 8-12 plants per meter squared in 10-12L containers
2. Remove side branches and shoots that are below the canopy
3. Defoliate any growth that is below the canopy to increase airflow
4. During the flowering stage, all resources should be focused on the main colas
5. Plants will be around 30-35 cm tall at harvest

SOG aims to train your plants to maximize the growing area by centralizing resources. When executed correctly, you can pump out 500-600 grams in every square meter.

Resistance to Pests and Diseases

BCN Critical XXL seeds have been genetically modified to repel pests, diseases, and mold naturally. However, we still recommend keeping your grow area sanitary, reducing humidity during flowering, promoting airflow, and closely monitoring your plants during development.

If you run into an issue like spider mites or mold, take care of the problem as quickly as possible to limit damage and save your harvest.

BCN Critical XXL Strain Description and Properties

BCN Critical XXL Physical Characteristics

Few stains have the physical appeal of the Critical Mass family. If you are already a fan of the lineage, we guarantee you won’t be disappointed with this improvement on the pedigree. In the remainder of our guide, we’ll thoroughly analyze the strain’s properties, including physical characteristics, cannabinoid content, potential medical applications, and a detailed breakdown of the high.


The most recognizable characteristic of BCN Critical XXL is her large buds that are densely packed with resinous trichomes. As a result, the plant naturally develops strong, sturdy stems to support the weight of its oversized buds.

Your leaves will be large and broad, with a range of electric to a dark shade of green. The buds themselves are typically elongated and tapered, with a conical shape. While primarily green, they are often punctuated with shades of purple or orange. The orange pistils that grow out of the buds contrast beautifully against the green foliage.


BCN Critical XXL has a strong and pungent aroma typical of the Critical family. Its buds have a musky and earthy scent with citrus and pine notes. When smoked or vaporized, the fragrance is amplified, releasing a sweet and spicy scent that lingers in the air.


The iconic flavor of BCN Critical XXL is similar to its aroma, combining sweet, earthy, and spicy notes. Her smoke is smooth and easy to inhale, with a slightly herbal and floral aftertaste. You’ll notice a strong citrus flavor on your tongue long after you’ve stopped smoking.

If you’ve tried Critical Mass or other members of the lineage, you’ll notice some similarities. The main difference we’ve experienced is that CM leans skunky and woody, whereas CBN Critical XXL features more fruity flavors. We assume the significant amounts of limonene drive the citrus to the forefront of the strain’s flavor profile.

Cannabinoid Content

BCN Critical XXL is a high-THC strain, with levels averaging between 20-24%. It also contains trace amounts of other cannabinoids, including CBD, CBN, and CBC. While THC content in the low 20s isn’t considered a heavy hitter in today’s cannabis industry, don’t underestimate the overall cannabinoid production of this strain. Under the right conditions, your total cannabinoid potency levels will be on par with higher THC-producing cultivars.

Dominant Terpenes in BCN Critical XXL Cannabis

The most common terpenes in the BCN Critical XXL strain are myrcene, pinene, and limonene. All are common cannabis terpenes with unique properties that play a crucial role in delivering the stain’s balanced effects.

Below are some of the benefits associated with each of these terpenes, according to the National Institute of Health:

  • Myrcene – sedative, anti-inflammatory, antidiabetic, antioxidant, antibacterial, and anticancer effects
  • Limonene – anti-inflammatory, antioxidant, antinociceptive, anticancer, antidiabetic, antihyperalgesic, antiviral, and gastroprotective
  • Pinene – anti-inflammatory, antioxidant, and neuroprotective

BCN Critical XXL Strain Effects

The effects of BCN Critical XXL are primarily cerebral, with a potent head high that can last for several hours. Users report feeling happy, euphoric, and creative, with a burst of energy and motivation. As the high progresses, the effects become more relaxing, with a soothing body buzz that can help relieve stress and tension.

As a nearly perfectly balanced hybrid, the effects give you the best of both worlds. Initially, you will experience an uplifting, energizing sensation. The first couple hours of the high will influence you to be proactive or get your creative juices flowing. Then, you’ll be overcome with a deep sensation of relaxation.

BCN Critical XXL will deliver the effects you need regardless of the time of day. However, if you want a better night’s sleep, we recommend smoking an hour or two before bed. This way, you’ll get over the initial energy boost, relax, and enjoy better quality sleep.

BCN Critical XXL’s Medical Potential

BCN Critical XXL has several potential medical benefits, including pain relief, stress reduction, and mood enhancement. Its high THC content may also help alleviate symptoms of depression, anxiety, and PTSD. Additionally, some users report that BCN Critical XXL can help stimulate appetite and relieve nausea, making it a good choice for patients undergoing chemotherapy.

Adverse Effects of BCN Critical XXL Weed

All highly potent cannabis strains need to be treated with respect. Consuming too much in a short period can be overwhelming and lead to adverse side effects that make the experience unpleasant.

When using BCB Critical XXL cannabis in large amounts, you could experience dry eyes or mouth, paranoia, short-term memory loss, or feelings of anxiety. If you are new to consuming potent cannabis strains and want to avoid side effects, we recommend starting with a low dose and waiting a few hours to assess the high.

Pros/Cons of Growing BCN Critical XXL Seeds


  • Robust genetic profile
  • Easy to grow
  • Superior flavor and taste
  • Incredible hybrid effects
  • Perfect candidate for SOG
  • High yields


  • Relatively moderate THC content
Watch: BCN Critical XXL Indoor Grow

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