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McKennaii — Classic Grow Kit XL — Cloud920®
Looking for a classic, tried-and-tested strain with proven potency that delivers results year after year? The McKennaii is the answer. This is the strain serious cultivators return to again and again—a legendary variety that has earned its reputation as one of the most reliable, visually intense, and philosophically profound experiences available.
This is a cultivator’s favorite: easy to grow, consistently strong, and respected worldwide for its outstanding performance and genuine effects. When you want a strain you can trust, McKennaii is the standard.
Availability: In stock
€54.95
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Product Description
Details
The McKennaii stands as one of the most established and widely recognized strains in the psilocybin cultivation community. This is the strain that has stood the test of time—proven across thousands of successful grows, reliable genetics, and consistent results that keep cultivators coming back.
What Makes McKennaii a Classic?
Named in honor of Terence McKenna, the legendary ethnobotanist and psychedelic advocate, the McKennaii strain emerged in the late 20th century and has since become a staple in cultivation communities across Europe and North America. Unlike newer strains still being perfected, McKennaii’s genetics are refined and stable—the strain performs reliably across multiple generations and diverse growing conditions.
The Genetics Story:
The McKennaii is celebrated for its genetic stability and robust mycelium growth. This strain is known for its aggressive, fast colonization, making it relatively beginner-friendly despite its powerful effects. The mushrooms display characteristic medium to large bell-shaped caps ranging from dark tan to light brown, supported by thick, sturdy stems—a morphology that remains consistent batch after batch.
Unlike strains still being refined or those with unpredictable genetics, McKennaii delivers predictable, excellent results. This consistency is precisely why it remains one of the most popular choices among both novice and experienced cultivators worldwide.
Why the Classic XL Format?
While Cloud920® is known for its innovative Ready-to-Grow Bags found elsewhere on this site, the Classic XL Growkit represents a return to the traditional cultivation method beloved by experienced growers.
What’s the Difference?
- Classic Growkits use the time-tested box-and-bag method where you soak the substrate, place it in a grow bag with water at the bottom, and manage humidity through the growing process
- Ready-to-Grow Bags are the newer all-in-one approach where everything happens inside a sealed bag with minimal intervention
Why Choose Classic XL for McKennaii?
- More hands-on control for cultivators who enjoy the traditional process
- Familiar techniques for those who’ve grown with GetMagic® or similar classic kits
- The satisfaction of mastering the art of mushroom cultivation the way seasoned growers have done it for years
- A proven method that brings out the best in this reliable, established strain
XL Size Means Serious Yields:
With 2100cc of fully colonized substrate, the Cloud920® Classic XL delivers exceptional harvests with the McKennaii strain. Expect multiple flushes with the first flush providing the highest yield—potentially 400-800 grams of fresh mushrooms over the lifetime of your kit.
What’s Included in Your Cloud920® Classic XL Growkit
Your cultivation package includes:
- 1x Grow Box Container (2100cc) - Plastic box containing fully colonized substrate with McKennaii mycelium, ready to fruit
- 1x Grow Bag with Air Filter - Large cultivation bag with microperforation filters for optimal gas exchange
- 2x Paper Clips or Bag Clips - For securely closing the grow bag
Growing Instructions
The Cloud920® Classic XL uses the proven traditional method that has successfully produced millions of harvests worldwide.
Full detailed growing instructions can be found at: https://www.magic-mushrooms-shop.com/blog/cloud920-classic-xl-growkit
Note: Instructions are not included in the physical kit package but are freely accessible online at the link above
The Experience: What Makes McKennaii the Cultivator’s Choice
The McKennaii strain is renowned worldwide for delivering one of the most visually intense and introspectively profound experiences in the Psilocybe cubensis family. This is a classic for good reason—it consistently produces powerful, transformative experiences with exceptional reliability.
The strain consistently produces:
- Extreme visual effects with vivid geometric patterns, fractals, and color distortions
- Profound philosophical insights and deeply introspective journeys characteristic of Terence McKenna’s teachings on consciousness expansion
- Strong spiritual connection with potential for mystical experiences and ego dissolution
- Waves of euphoria and emotional clarity combined with a sense of loving detachment
- Altered perception of time and space creating a sense of timelessness and perspective shift
- Enhanced creative thinking and novel problem-solving abilities
Users frequently describe McKennaii as one of the most powerful recreational strains available—visually stunning, mentally transformative, and spiritually significant. Many report mystical trips that are genuinely “out-of-this-world,” with insights delivered with surprising clarity and grace.
With reliably strong potency that appeals to experienced psychonauts while remaining approachable for cultivators with foundational knowledge, McKennaii delivers experiences that are both authentic and consistently profound. This is the classic strain—not for its rarity, but for its proven excellence, rock-solid genetics, and the profound journeys it reliably facilitates.
Additional Info
Additional Info
| Productcode | MCS.GKMYC.053-MCKE-2100 |
|---|---|
| Weight (KG) | 1.4000 |
| Mushroom Strain | McKennaii |
| Brand | Cloud920® Classic Box |
| Difficulty | Moderate |
| Size | Extra Large |
| Species | Psilocybe cubensis |
| Origin | No |
| Potency | High |
| Optimum cultivation temperature | 23ºC |
| Yield (from) | 300 grams |
| Yield (to) | 800 gram |
| Water Spray Needed | Yes |
Customer Reviews
- Very satisfied Review by Beginner
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As advertised: good amounts of potent mushrooms. On a third wave now (Posted on 10/20/2026)Rating - Bene, ma poco raccolto Review by Matteo
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Great experience! The shipping was fast and the kit arrived in perfect condition. The first pins appeared after just a few days, and the first harvest came after about 8 days. By the fourth week, I am about to harvest the third flush, so I am really satisfied with the consistency of the kit. It has also performed very well compared with my initial expectations and proved to be reliable. Overall, I am very happy with my purchase and would definitely buy it again. (Posted on 8/25/2026)Rating - 4th Cloud920 McKennaii kit Review by DK
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This is my 4th Cloud920 McKennai kit and AGAIN it did not disappoint!Rating
I am currently onto my 4th flush, and it has just started to pin.
I achieved the following cracker dry yields: 1st flush 24g - 2nd flush 8g - 3rd flush 5g. (Posted on 8/21/2026) - Excellent Customer Service Review by DK
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This was my fourth Cloud920 McKennaii kit that I have purchased from the Magic Mushroom Shop. Unfortunately, the kit was contaminated from the start. I contacted customer services and without any fuss or hesitation they sent me out a new kit. I have already harvested my first flush from the new kit.Rating
Thank you for replacing the contaminated kit with no fuss or hesitation.
(Posted on 7/29/2026) - Mckeneii Review by Nikolas
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I love the fastnest of this kit, 4 days in and allready pinning.Rating
Also very resiliant. About 40g easy in 3-4 weeks (Posted on 7/17/2026) - I can only recommend it! Review by Mefisztó
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I was very satisfied with the McKennaii XL grow kit! It was perfect in every way, very durable and produced a really good crop. I can only recommend it! (Posted on 7/1/2026)Rating - Sehr zufrieden Review by Atomic
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Dieses Kit war das beste, das ich jemals hatte. Ich beziehe seit einigen Jahren meine Growkits über MMS, aber diese Kultur / Charge war außergewöhnlich gut. Ich konnte insgesamt 4x ernten und auch die 4. Ernte war noch sehr stark in der Wirkung.Rating
Ich möchte mich an dieser Stelle ganz herzlich bedanken bei dem tollen Support durch den Customer Service, insbesondere bei Lotti, die mir sehr freundlich und kompetent weitergeholfen hatte.
Ich kann das Kit und auch MMS unbedingt weiterempfehlen und werde auch künftig hier meine Kits bestellen. (Posted on 6/19/2026) - Amazing Review by Filippo
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The best product I’ve ever got (Posted on 6/18/2026)Rating - Gentle healer Review by Julia
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This strain has shown itself incredibly powerful. Not as strong as certain others but very gentle in how it comes on. Incredibly deep and softer than many others, although given the amount it will offer universally deep experiences outside space/time. Still quite strong/potent but simply guiding you with less discomfort, which is very useful when working with healing. (Posted on 6/16/2026)Rating - Mckeneii Review by Nikolas
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Bountifull yield and fast fruiting in about 4-7 days. (Posted on 6/8/2026)Rating - 3rd Cloud920 McKennai kit purchased Review by DK
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This is my 3rd Cloud920 McKennai kit from the Magic Mushrooms Shop and AGAIN it did not disappoint!Rating
My cultivation skills must have improved! I have just attempted my 4th flush. I have not achieved this before and hopefully the substrate will not be exhausted and will bear further pins and shrooms.
Although it is not recommended due to bacterial infection etc, I removed the substrate from the container before setting up the 1st flush to avoid side pinning. In my opinion side pinning reduces the flush as the shrooms do not have adequate space to grow. I believe that my yields have improved by removing the substrate from the shipping container therefore reducing / eliminating side pinning.
I achieved the following cracker dry yields: 1st flush 24.4g - 2nd flush 9.2g - 3rd flush 7.9g.
Happy growing.
(Posted on 5/28/2026) - Mcenai Review by Sebastian
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very good muschroms (Posted on 5/23/2026)Rating - +++++ Review by Sebastian
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good stuff (Posted on 5/23/2026)Rating - High yield, quick Review by ATX
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Did originally buy a stanard mckennaii grow kit, this didnt grow as well as it should have. Spoke to customer service and they were great and suggested i buy an xl grow kit. This grew very quickly with a high yield. First yield i had 250g, on to the second yield! Big fat chunky mushies! 10/10 (Posted on 5/20/2026)Rating - low harvest Review by Ralfy
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Quite disappointed - got 4 flushes resulting in total of 31.12 grams of dried material despite conditions being perfect. Potency was OK. (Posted on 5/19/2026)Rating - Greate customer service!! Review by Doria
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Greate customer service and shipping, good quality kits and pretty high pottency. Recomended for middle- low trips. (Posted on 5/15/2026)Rating - Third flush Review by Peter
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I am getting my third flush of this kit at the moment. That is great. The flushes are not so affluent as on the picture, but still ok. Support is great. (Posted on 5/12/2026)Rating - Excellent growing kit Review by Anna
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I am a beginner and this was my first growing kit ever. Very easy to grow, fast pinning (in just 5 days), three flushes, good harvest (480 gr). I totally recommend it. (Posted on 5/4/2026)Rating - Abundance of mushrooms Review by Sorin
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The kits produced lots of mushrooms. I am very happy. (Posted on 4/21/2026)Rating - This is my 2nd Cloud920 McKennai kit from the Magic Mushrooms Shop and it did not disappoint! Review by DK
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1st flush - Fresh air exchange started 3 days after set up. Pins started to appear at day 8 at both the top and all sides of the cake. The mature fruits were harvested between days 14 and 25. Most of the pins grew at the sides of the cake and got squashed. The harvest was cracker dry at day 27 using the fan / silica drying method. The 1st flush cracker dry yield was 20.7g. I was pleased with this yield. I used a heat mat with the thermostat held constant at 21C that promoted a very light humidity.Rating
2nd flush – After harvesting the 1st flush, I misted the top of the cake with x25 misting sprays to rehydrate it. I used the same approach as the 1st flush i.e. heat mat, fresh air exchange started 3 days after misting and very light humidity. Pins started to appear at day 5. At day 10 I noticed most of the pins were growing at the side of the cake and getting cramped (like the 1st flush), so I carefully removed the cake from the container base and replaced it on the container lid to allow more space for the side pins to grow. The mature fruits were harvested at day 12. The harvest was cracker dry at day 15. The 2nd flush cracker dry yield was 5.3g. I was pleased with this yield but did expect a little bit more.
3rd flush – I am 3 days into my 3rd flush, and it appears that pins are already starting to form. Before starting the 3rd flush, I soaked the cake for 8 hours. I am using the container lid instead of the container base to avoid limiting the growth of any side pins.
MMS: Great to hear that this method of removing the substrate from the plastic box worked well for you! While this can sometimes help side pins develop better, it is not recommended in every situation. If you ever experience issues or are unsure which method is best for your kit, feel free to contact our customer support so we can find the most suitable solution for your specific case. (Posted on 3/27/2026)
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