McKennaii XL Mushroom Grow Bag

The McKennaii XL Mushroom Grow Bag contains a fully colonized substrate with Psilocybe cubensis McKennaii mycelium. This well-known variety is characterized by active growth, classic cubensis shape, and recognizable golden-brown caps. Because the substrate is already fully colonized, several preparatory steps of the cultivation process have already been completed.

McKennaii is a popular variety within the Psilocybe cubensis family. The species is chosen by both novice and more experienced growers looking for a fully colonized grow bag that allows them to start the fruiting phase without inoculating themselves.

The name McKennaii is usually associated with the American author and ethnobotanical thinker Terence McKenna. However, the exact genetic origin and naming of this commercial cubensis variety are not fully documented.

Grow McKennaii mushrooms yourself

The McKennaii XL Mushroom Grow Bag contains 2,200 ml of fully colonized substrate. This means you don’t have to inoculate with spores or sterilize and prepare the substrate yourself. The grow bag can be prepared for the fruiting phase immediately according to the included instructions.

Under suitable conditions, the total yield according to product specifications can reach approximately 700 g of fresh mushrooms. The actual yield varies per grow and is influenced by temperature, air exchange, hygiene, and general care, among other factors.

By keeping the conditions during the fruiting phase as stable as possible, the mycelium is given the best opportunity to develop fruiting bodies.

What are the effects of McKennaii mushrooms?

McKennaii belongs to the psilocybin-containing Psilocybe cubensis varieties. The experience with psilocybin varies greatly per person and is influenced by the amount used, individual sensitivity, mindset, and environment, among other factors.

• Altered perception: colors, shapes, and patterns may be experienced differently.
• Visual changes: depending on the amount, patterns and other visual effects may occur.
• Altered thought patterns: thoughts and the perception of time and surroundings may change.
• Introspective experience: attention to thoughts, emotions, and the environment may change.

The amount of active substances in natural mushrooms can vary per harvest and individual fruiting body. Therefore, a certain strength or experience cannot be guaranteed.

McKennaii within the Psilocybe cubensis family

McKennaii is a well-known commercial variety of Psilocybe cubensis. The mushrooms typically have the recognizable build of this species, with a light to golden-brown cap and a relatively slender stem.

The name is often linked to Terence McKenna, who became famous for his books, lectures, and interest in psychedelics and ethnobotany. However, there is no widely documented genetic history confirming that McKenna himself was involved in the creation of this specific variety.

McKennaii Grow Bag Instructions

Make sure your work area is clean to prevent other microorganisms from contaminating your grow kit. Working hygienically is important throughout the entire cultivation process.

Always use clean tap water or mineral water when required by the instructions. Do not use distilled or demineralized water.

Grow Guide

Download the PDF instructions here: MysticFungi Instructions

Step 1 – Inspect the grow bag

Carefully check the grow bag before you start cultivation.

Check:

• ✅ The mycelium is white or yellowish-white.
• ✅ The grow bag is completely intact.

Do not use the grow bag if:

• ❌ Green, black, red, or pink spots are visible.
• ❌ The bag is damaged or leaking.

Is the grow bag contaminated or damaged?
If so, contact customer service before starting the grow.

Step 2 – Work hygienically

A clean working method helps limit the risk of contamination during the cultivation process.

1. Wash your hands and forearms thoroughly with antibacterial soap.
2. Disinfect your hands and the work surface.
3. Tie back long hair.
4. Preferably wear sterile gloves and a face mask.
5. Work in a clean and draft-free space.

Important: only open the grow bag when the first mushroom pins (pins) are visible.

Step 3 – Activate the grow bag

1. Place the grow bag in a bright spot with indirect sunlight.
2. Keep the temperature between 23 and 27°C.
3. Ensure the temperature never exceeds 27°C.

Leave the grow bag alone as much as possible during this phase. The moment the first pins appear can vary per grow.

Step 4 – Let the mushrooms grow

Once the first pins are visible:

1. Make a small opening at the top of the bag for fresh air.
2. Are the mushrooms growing further and do they need more space? Then remove a strip of 2 to 4 cm from the top of the bag.

A small slit may be visible under the air filter of the grow bag. This opening was made by the manufacturer to vent excess CO₂ and built-up pressure when the bag becomes bloated. This is normal and the opening does not need to be taped shut.

Step 5 – Harvest the mushrooms

1. First repeat the hygiene steps from Step 2.
2. Harvest the mushrooms before the caps are fully open.
3. Gently twist the mushrooms loose and remove them from the substrate.
4. Have all mushrooms been harvested? Then follow the included instructions for further use of the substrate.

Tips

• Touch the grow bag as little as possible to prevent contamination.
• Ensure sufficient fresh air and indirect light.
• Preferably keep the temperature between 24 and 27°C.
• Avoid large temperature fluctuations.
• Do not open the bag until the first pins are visible.
• Work with clean hands and clean materials during every step.
• Harvest before the caps fully open to limit the spread of spores.
• Always follow the included MysticFungi manual.

Package Contents

• 1 grow kit with fully colonized Psilocybe cubensis McKennaii substrate
• 1 grow bag with air filter
• Volume: 2200 ml
• Variety: McKennaii
• Maximum yield indication: up to approx. 700 g fresh weight under suitable conditions

How do I store the McKennaii Grow Kit?

For the best results, start the cultivation as soon as possible after receipt. Postponing the grow can affect the condition and ultimate performance of the mycelium.

If you cannot start immediately, the grow kit can be stored for a maximum of about two weeks in the refrigerator at 2°C to 8°C. Leave the grow bag with mycelium in its original packaging and place it in a clean refrigerator without visible mold.

For extra protection, the packaging can be placed in a clean plastic bag or an additional grow bag. Do not leave the kit outside the recommended storage conditions for unnecessarily long periods.