McKennaii Cloud920® Classic XL

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.