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Magic mushroom grow kit McKennaii XP by FreshMushrooms®

The way the McKennaii magic mushrooms grow is as outlandish as their effect. The caps go from big to small, straight to bent, thick to thin stems, light color yellow to dark brown. Be prepared for anything. The trip can go deep, colorful, speedy and sexual.

Availability: Less than 10 in stock

Multi Banco
Product Description

Growing with the McKennaii XP Fresh Mushrooms Grow Kits is extremely easy. These kits are completely maintenance-free thanks to a fully colonized substrate without fillers. You hardly have to do anything to get your first flush with high levels of psilocin. Follow the instructions below and you will be assured a high harvest of mushrooms!

  • Fast growing: 1 week to first pins
  • High yields: Up to 4 flushes. (in ideal conditions)
  • High Potency: According the supplier the XP (Extra Potent) strains are twice as potent!

Contents of McKennaii XP Mushroom Grow Kit

  • 1x McKennaii Mushrooms Grow box – This contains rye substrate with active mycelium
  • 1x Growbag – The bag has filters across the bag.
  • 2x paperclip – For closing the grow bag.

You need

  • Misting Bottle  – Misting is needed for the humidity level
  • Potable water – For misting and soaking
  • Clean environment – Work clean to give other fungi and bacteria (micro organisms) no chance to contaminate.

We recommend using

How to prepare the room and yourself before you begin

  • Close any open windows. Wind or draft may bring micro organisms that can contaminate the Magic Mushroom grow kit.
  • When taking out the grow box with the cake from the carton box, put it on a disinfected surface. If this surface would not be clean, micro organisms may attach to the grow box and will flourish inside the Magic Mushroom grow kit, and will contaminate the grow box.
  • Make sure you work with clean hands and arms. We recommend using surgical gloves or a good disinfectant when handling the kit. You should use a facemask to avoid breathing into the grow bag and on the cake.

Instructions: Starting the McKennaii Magic Mushroom grow kit

    1. Take the magic mushroom grow kit, plastic bag and paperclip out of the box. Remove the lid of the mushroom grow kit (store the lid properly). Rinse the lid under running water. You will need it again later (step 7).
    2. Place the mushroom grow kit without lid in the plastic grow bag (opening at the top). Slide the opening of the bag under the bottom with the micro perforation pointing upwards. The opening of the bag is now largely closed. You do not have to worry about air circulation.
    3. When you see the first small mushrooms ( called pins), you can put the grow bag upright. Do not water! The first magic mushrooms will be visible after about 1 week.
    4. Place the mushroom grow kit in an area with enough daylight and at a temperature between 18 °C and 28 °C. NEVER place the grow kit in direct sunlight. Although mushrooms will grow at almost any temperature above 15 °C, 23 °C is the ideal temperature for an optimal harvest. Special heat mats are available to ensure this temperature and not have to heat the entire room.
    5. When the mushrooms are slightly bigger as the pins keep the bag a bit open the entire time so the moisture can evaporate (Phase 2). Too much moisture is not good.

The first mushrooms will be visible after approximately 1 week. Your first harvest will be about a week later. Make sure that you harvest before the first spores begin to fall! Freshmushrooms grow kits produce their first harvest fairly quickly. The first buds are already visible after only 1 week. Low and high temperatures may slightly delay this growth process. It usually takes one to two weeks before the mushrooms are fully developed.

  1. These kits can produce several mushroom harvests. To do so, fill the kit with clean tap water after the first harvest. This process is known as cold shock. It breathes new life into the mycelium and ensures that enough moisture is present for the mushrooms to grow.
  2. Place the lid of the grow Kit back on the kit. Let the kit rest for 12 hours. Open a corner of the lid and drain the excess water. From here you can follow the instructions from step 1 again. This process can be repeated several times.

Growing with a heatingmat (use only for this brand)

Place the plastic bag with the Grow Kit in it on the heat mat. Switch the heat mat on. After two days switch the heat mat off and wait until the buds have developed, which usually takes between five and ten days. Then switch the heat mat on again and open the top of the bag a little so the moisture can evaporate.

What to do if the buds haven’t developed after ten days. Take the cake out of the plastic box, put it back in the plastic box on its side and start again with two days with the heat mat.

How to store the grow kit correctly

It is recommended to start the cultivation process right away. If you decide to start growing later, you may store themagic mushroom grow kit inside a Soaking Bag in the refrigerator (2°C to 8°C) for 4 weeks after the production date.


The ideal temperature is 24°C. Do not have the temperature drop under 18°C and not exceed 29°C. To keep the temperature from dropping under the 18°C, you can use a thermo mat to maintain the ideal temperature. A thermo mat is a must-have in the winter or colder regions of the world.


The magic mushroom grow kit only needs light for the mycelium to ‘understand’ it has reached the surface. Only then, mushrooms will grow. A few hours of fluorescent/artificial light or indirect sunlight a day is more than enough. Direct sunlight kills the mycelium, so avoid the sun to shine directly on the grow kit.


If the conditions are optimal, you can expect the first small mushrooms (the pins) to appear between 7 and 10
days. This also depends on the strain. Some cubensis strains grow slower than others.


The mushrooms come up in groups. This can be a small or large group. That depends on the strain. A growth like this is called a flush. Mushrooms are almost never ripe at the same time. You can get more than one flush out of a kit. The first two flushes are the largest. When more flushes come, they will be smaller than the previous one.


Mushrooms are ripe and should be picked when the veil between the hat and the stem has just torn. Don’t wait much longer. Use surgical gloves or disinfect your hands, wrists and arms. Pick the mushrooms that are ripe and let the others continue to grow. The cake has no top layer such as vermiculite. This makes is much easier to pick the mushrooms than with the standard grow kits. The mushrooms can easily be pulled out of the cake by holding them between thumb and index finger. They mushrooms let go almost immediately. When most of the larger mushrooms have been picked, also pick the smaller ones and the pins as well.

Mushrooms that grow from the sides

Mushrooms grow where the light reaches and where there is little penetrating resistance. Because the cake has light shining on the sides, the mushrooms might also grow there. It is hard to counter this and can be allowed. Some growers wrap the sides of the grow box in aluminum foil to keep the sides dark, but this doesn’t always work well.

When mushrooms grow there, they can be picked just before you soak the kit:

Clean hands! Take the grow box out of the bag and place it upside down on your other hand. Wiggle the plastic box so that the cake will fall out, onto your hand. The plastic box can be placed on a disinfectant surface. Now you have this hand free to pick the mushrooms from the sides of the cake. When all mushrooms are picked, you can place the cake back as it was, in the plastic box and continue to the soaking process.

The end

When no more mushrooms grow out of a grow kit after the second flush for at least three weeks, or when the Magic Mushroom grow kit turns green, red, grey or yellow; the grow kit can be disposed of.  The change in color is a sign that the grow kit is contaminated with another fungus or a bacteria. No more mushrooms will grow out of the Psilocybe cubensis Magic mushroom grow kit and the grow kit should be thrown away in the garbage outside.


When you are too late picking the mushrooms, they will drop their spores. The cake and the mushrooms will turn black/purple (some other cubensis strains red/brown) because of the spores. This is not really a problem; it just doesn’t look very pretty. When mushrooms release their spores, they also start to degrade and the active ingredients are breaking down. Mushrooms will lose some of their potency.

Be sensible

Check out the responsible use page for more information on do’s and don’ts.

This kit is meant for small-scale home use only.

Additional Info
Additional Info
Productcode MCS.GKMYC.003-MCKE-1200
Weight (KG) 1.1000
Mushroom Strain McKennaii
Grow Kit type FreshMushrooms
Difficulty Easy
Size Normal
Species Psilocybe cubensis
Origin Netherlands
Potency Average / High
Optimum cultivation temperature 24ºC
Yield (from) 100 grams
Yield (to) 300 gram
Water Spray Needed Yes

Customer Reviews

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Good Review by Lv
Good (Posted on 12/14/2023)
Mushrooms are lovely, but not the quantity! Review by Lora
Pretty fast delivery!
I got only two flushes, also not so much mushrooms in each one of them. Overall, growing was easy, maybe next time I will try growing without heat mat, hope that gives different results. I am grateful for the mushrooms that I did get!
Next time will try a different kit tho! Thank you. (Posted on 3/15/2023)
Good value for money Review by Ida
Growing is easy. A week after opening the kit, the first mushrooms started. We got about 9 gram of dried mushrooms, that from our point of view covered the cost price. We had nice trip using it, a lot of laughs and good atmosphere. The second flash was more challenging as the temperature dropped. I bought the heating mat, and the second flash is ongoing now, and more mushrooms are growing. We'll harvest them in the next days.
Definitely going to order more kits! (Posted on 2/27/2023)
Great product Review by Vladimir
Fast delivery. I have already harvested the first crop and I hope there will be more (Posted on 2/16/2023)
Good potency Review by Pedro
I don't like so much this technique because I never had so much quantity but the potency of this mushroom is really good. I try only 1 gr and was really nice walk .
I made with first flush 20 gr dry. Second flush looks like is coming with quantity. I recommend but I prefer other techniques. (Posted on 12/17/2022)
fresh and descent flush Review by quentin
fluffy box thx (Posted on 11/9/2022)
Wonderful Review by alessia
Really Powerful strain (Posted on 9/11/2022)
Not tried yet Review by Mark
However I have missed the start (I did not follow the instructions properly, due to an old habit I put water on it when started), the kit survived and right now the third flush is running, the second was more than the first. This is the 4th kit in my experience but the most succesfull concerning the quantity. (Posted on 6/5/2022)
The best product on market Review by Joshep
MCK variety of fresh mushrooms are the best, the most potent ones and I have been buying this product for years. 100% quality and yield. (Posted on 4/19/2022)
guarantee of security Review by Sejkyč
I have been buying the McKennai tribe for a long time and I am most satisfied with its yield and effect. If you want to look inside and perceive the world outside, this model will certainly allow you to do so. (Posted on 4/3/2022)
Not satisfied Review by Not satisfied
First flush gave me only 46g, second 22g, and it doesn't seems like there will be third one.. Disappointed..
(Posted on 2/16/2022)
the mushrooms are great Review by Vladimir
The mushrooms are great, but unfortunately the last two fresh kits I ordered gave only one harvest, and about 50% of what is expected (Posted on 12/31/2021)
Excellent Product & Customer Service Review by Rusty
The products are wonderful but I had a problem with shipping and Frank M went to bat for me and solved my problem right away. Thanks so much for all you do. (Posted on 10/18/2021)
Very good Review by Teodor
Fast delivery, nice yield in all 3 grows, no problems encountered. It was my first grow and it was easy. (Posted on 9/16/2021)
Forgot to rate Review by Rusty
Still learning but it's so easy and the results are fantastic. (Posted on 7/14/2021)
I'm learning Review by Rusty
The first harvest was amazing but I let it go a bit to long because it grows so fast which is amazing. Thanks. (Posted on 7/14/2021)
3 flush still going Review by Stonhed
Nice kit was my first one all was going fine guess hard to mess it up.
for overyone that isnt sure how to grow them (FreshMushrooms®) kits there is a other how to on the website from them. (Posted on 7/8/2021)
Nice Review by Mark
I got about 280-300g from total of 4flushes, very easy and fast grow. I got about 25-30g dried shrooms from it and an average person does need about 3g for a nice trip. Not a bad product at all. (Posted on 6/26/2021)
It would be good if it would not be XP grow kit Review by :)
The shrooms themselves are ok, for me they give more physical trip, body starts to feel very heavy,and super light at the same time. They are very good tools to get yur mind out of everyday world and take a look at everything from other perspective.

But I think that XP added is for marketing etc, because they did not felt more potent than shrooms from standart grow kits. Also the shrooms were very small. Got 4 harvests out of this grow kit, but the last one was only 3 small shrooms. Also the third harvest vas very small, with small shrooms.

Overall as I said - I expected a lot more from XP grow kit, I have managed to get way better results (more harvest and potency) from standart grow kits.

(Posted on 6/6/2021)
Very easy to grow. Review by /v
I got this kit along with the Mondo version a month ago and I am very happy. This particular kit was very easy to grow as for the initial growth you don't need to do anything but to watch them and give them love. The first harvest was not big, but the second was nice. They are still growing. No problems with contamination. I guess that next time I will still spray the insides of the bag for the initial growth just to try it out and see if it will be better. The Mondo kit is also good. I still don't know what will be the difference in terms of potency compared to the Mondo kit because I tried only this one and I had a real good time ; ). I will write another review when I taste the Mondo one as well. I removed one star just because my initial harvest was very slim. But after that everything was great. These are very intelligent creatures. (Posted on 4/9/2021)

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Important information about FreshMushrooms® grow kit McKennaii

  • The purchase of this product is restricted to individuals who are at least 18 years old.
  • By initiating a purchase, you confirm knowledge of and compliance with the legal terms regarding the product(s) in your country of residence, as well as your eligibility to acquire and hold them.
  • Shipping restrictions apply to this product. Refer to Additional Info to discover our non-delivery zones.
  • Engaging in the consumption of magic mushrooms is solely your responsibility, so be certain to thoroughly educate yourself about their usage and consequential effects.
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