Critical XXL

 Same Day Dispatch Information

We will always strive to dispatch orders for special delivery placed before 10am on the same working day, however please note all orders are subject to our usual processing time of upto two working days. Quoted delivery time is from point of dispatch.

 Free Cannabis Seeds

Everybody loves freebies right?

When you shop at the London Seed Centre you are guaranteed a minimum of one free seed with every order.

The more you spend the more free seeds you’ll receive bundled in with your order.

What’s more, our freebies are some of the most popular strains on the market provided by the most reputable manufacturers, so rest assured you won’t be disappointed!

Quantities and strains adjust with order size and value

Don’t forget to sign up to the London Seed Centre today to claim your seed chips for extra discounts on your orders, plus a load of bonus perks for being a valued LSC member.

*Kindly note that free seeds strains are subject to availability, and may be swapped out with different strains if they become out of stock. We alway do our best however to supply a strain of similar characteristics to the seeds on your order. Thank you for understanding.

Critical XXL will impress cannabis connoisseurs and enthusiasts because In such a short time you are guaranteed solid top-notch high grade nuggets.

Price from £10.50
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The Critical XXL feminized seeds are the result of lengthy breeding efforts by GOG with the legendary Critical Mass strain. We crossed the Critical + from the Basque woods with the Kritikal Bilbo to make it. The resulting offspring were then used for breeding an actual Critical Mass. The resulting strain is responsive to all the genetic traits it inherited from its forebears, including high THC concentration and greexcellentelds while remaining cost-effective. This genetic makeup displays a profile of potent cannabinoids, with concentrations of the hallucinogenic chemical THC reaching between 23% and 26%. The effect is synergistic between the mind and the body.

When Critical XXL seeds are germinated, they produce plants that are both manageable in size and low maintenance and perfectly adapted to their natural environments. This stabilized variety matures with a bountiful harvest of highly fragrant blooms.

When cultivated indoors, flowering is complete in about eight weeks. There is no indication of its potential duration outside, although its rapid growth rate suggests that it could be harvested by late summer at the earliest.

The yields from the Critical XXL super strain are unrivaled. When cultivated inside, results of 600 g/m2 are possible, while outdoor plants can produce up to a whopping 1000 g/plant.

The exhilarating scent of Critical XXL is instantly recognizable. This sugary bud can fill a room with its sweet, citrusy perfume. Feeling welcomed and motivated is a great way to start any day. It’s tasty and has a hint of skunkiness, coupled with the scent of freshly harvested honey.

Flavor-wise, this aromatic herb is about average. Critical XXL is well-known for offering every tempting taste imaginable. Skunky citrus flavor is what you’ll get when you inhale, and a sweet, earthy smoke flavor will be what you get when you exhale.

Whether you’re staying in for the night by yourself or with some buddies, Critical Mass will help you relax and have a good time. As long as you aren’t in charge of any heavy machinery, you may relax and have a pleasant journey despite the tremendous physical effort.

Drowsiness is a possible side effect of Critical Mass, so don’t be surprised if you eventually nod off after consuming a large amount of it. Users report feeling elated and ecstatic long after the benefits of Critical XXL have worn off, suggesting that the powerful body high may last for several hours. This mixture is excellent for individuals who could use a little pick-me-up because it keeps you in a happy mood and uplifts you.

More Information
Cup Winner No
Medicinal No
Flowering Type Standard
Yield High
THC Content Very High (over 20%)
CBD Content Medium (1-5%)
Environment Indoor, Outdoor, Greenhouse
Genetics Indica
Height Medium
Flowering Time 7-8 WEEKS


FREE 3-5 Day Standard Delivery™

Free standard delivery on your order for delivery within approximately 3-5 days.
(Applies to orders over £50 only)

Royal Mail Signed For™ 1st Class

Royal Mail Signed For 1st Class™ aims to deliver your letter or parcel the next working day however can take up to 3 days - and gives you the added benefits of check online or on your mobile to see where your item is (royal mail website) compensation cover up to £50.

Special Delivery Guaranteed Next Day™

Special Delivery Guaranteed by delivery the next working day. The benefits include end to end tracking and signature on delivery online or via your mobile (royal mail website) compensation cover up to £500 for loss and damagesend items up to 20kg


International Signed For™

For an overseas delivery service you can trust, look no further International Signed For™ mail is available worldwide and travels through a separate and secure network until it leaves the UK . Each item is individually listed and accounted for before being handed over to the airline. Proof of posting and compensation comes as standard, with the option to buy extra compensation up to £500*.

*sometimes £250, depending on the destination.

International Signed For™ items are tracked until they leave the UK when sent by Airmail. Tracking is also available in a number of overseas destinations to delivery.

Delivery aims:

  • to Europe within three to five working days of posting
  • to Rest of World within five to seven working days of posting

* Delivery is in working days and excludes day of posting, Saturdays and Sundays.



Trusted for fast and secure international mail Airsure® receives priority handling in the UK and abroad and is generally a day faster than standard Airmail.

Our aim is to deliver:

  • to Western Europe within two to three working days of posting
  • to Eastern Europe within three to four working days of posting
  • to the rest of the world within six to seven working days of posting.

* Delivery is in working days and excludes day of posting, Saturdays and Sundays.

Note: This service does not guarantee delivery within the timescales indicated. Neither does it offer compensation for delay or for missing tracking information.


Airmail will aim to deliver your mail to:

  • Western Europe within three working days
  • Eastern Europe within five working days
  • major cities worldwide within five working days and other destinations within seven..


You can exchange an unwanted item for a replacement or store credit of the same value if the item is still in the original breeder packet which remains sealed. We will not under any circumstances exchange or replace an open packet. Due to the nature of our products, we cannot give refunds. Kindly note that any items being sent back to us should be sent by recoreded delivery, and the tracking number sent to us by email to [email protected].


Website Legal Disclaimer:

  • Age Limit: Access is restricted to individuals 18 years or older.
  • Content Notice: This site contains information on cannabis seeds.
  • Compliance Requirement: We do not sell seeds to anyone intending illegal cultivation.
  • Legal Responsibility: By entering, you confirm compliance with your local and international cannabis laws. Continuing implies acceptance of these terms.