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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: In stock

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. As soon as the buds are visible, stop spraying the inside of the bag. 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 fm-mck
Weight (KG) 1.1000
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
Not shipped to: Non EU countries, Africa, Asia, Australia, Caribbean, Central America, Cyprus, Denmark, Germany, Iran, Ireland, Middle East, South America, Canada, Estonia, Finland, Israel , New Zealand, Norway, Russia, Sweden, Switzerland, Turkey, United Kingdom, United States
Customer Reviews (67)
Very good
Fast delivery, nice yield in all 3 grows, no problems encountered. It was my first grow and it was easy. Review by Teodor (Posted on 9/16/2021)
Forgot to rate
Still learning but it's so easy and the results are fantastic. Review by Rusty (Posted on 7/14/2021)
I'm learning
The first harvest was amazing but I let it go a bit to long because it grows so fast which is amazing. Thanks. Review by Rusty (Posted on 7/14/2021)
3 flush still going
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.
Review by Stonhed (Posted on 7/8/2021)
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. Review by Mark (Posted on 6/26/2021)
It would be good if it would not be XP grow kit
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.

Review by :) (Posted on 6/6/2021)
Very easy to grow.
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. Review by /v (Posted on 4/9/2021)
Philosophical strain
Fast delivery, easy to grow, large harvest, mild taste and strong mind stimulating effects. Reliable product. Review by Marek (Posted on 3/24/2021)
As always reliable and fast delivery abroad, I am extremely satisfied with the assortments. The store employees could still communicate via email when I ask them something about the goods, and that would be top. Review by Psychonaut (Posted on 2/15/2021)
It will open your eyes
Great service, very fast order processing, and delivery to the Czech Republic in about a week. After my experience, I am extremely satisfied with McKenai mushrooms, so I don't want to reach for others.
The state of these mushrooms is very intense in terms of philosophy, perception of the spirit of nature, and research at higher levels of consciousness.
Along with consuming the broth from the seeds of Harmaly Multifacial, you will enter a world of a completely different level!
Review by Ladislav (Posted on 1/12/2021)
Pretty good first impression
First time growing, the first and second flush was a pretty good amount but after that it got fewer and fewer. Alltogether yielded about 300g which became 30g dried up. For a good trip it took 1-1,8 for us (normal and above average man). So it was absolutely worthwile. Review by Aron (Posted on 11/24/2020)
Very good
I ordered 2 Mckennai and they were both easy to grow. The final product was very good quality and potency. Quantiy was also good! I really recommend this strain, and it's definetly my favorite one until now :) Review by Tudor (Posted on 11/18/2020)
Easy, low maintenance kit - strong trip
This kit was very simple to grow. Really hardly any effort required; however, with constant temperature control, the yield was still not great, about 200 grams total in 4 flushes. Also, they grew all over the sides of the container making harvest rather difficult. Review by Harls (Posted on 11/4/2020)
Great mushroom type and great kit
This is my favourite mushroom type. KIts may very but when you look after them properly you may get 5 full flushes of wonderful experiences. Highly recommended Review by Tim (Posted on 10/15/2020)
So far so good.
Fast shipping. Received grow kit three days after I paid. Followed instructions on preparing the kit and 12 days later first sprouts appeared. My room temperature remained a steady 26-27C. Hope to harvest soon. Will report back when that happens. Review by Zingaro (Posted on 9/12/2020)
Worst investment ever
I bought this kit and it came with mold and grown mushrooms. Once I’ve collected those mushrooms it never grew anything again. And the collected mushrooms had ZERO effect!!
Sad to say I’ll never order from magic mushroom shop again!!

MMS CUSTOMER SUPPORT EDIT: These are nature products so the result may turn out different than expected. Luckily we have a Customer Support Team, available to help out. I see that a colleague has sent you a new kit already and offered a fitting solution.
Review by Ines (Posted on 7/30/2020)
Awesome experience
Already have 4 harvests and still going... a really awesome shroom with great and deep experiences Review by Buster (Posted on 6/23/2020)
Very good mushrooms
Very fast growing and big harvest. On my experience best psylocibe cubensis strain. Review by Nick (Posted on 5/31/2020)
Wonderful !
I’ve been buying from MMS for a few years now. The service is great. This time round I had a box that didn’t yield many mushrooms, I had a discussion with one of the guys and he sent me a new box which is in its 3rd cycle and has so far produced 2 big flushes. I take the mushrooms a few times a year for a mental “reset”, they really work wonders. This strain is strong and can take you to another realm if you so wish to go. Don’t hesitate! Review by Joseph (Posted on 5/21/2020)
Good effect but low yield
After my first grow kit (amazonians) got contaminated on the first flush I ordered the McKennaii and tried again. Every flush took about a week (from start to harvest) so that was surpisingly fast. The mushrooms look great and the effect was very good, these are great mushrooms except they are not very strong. I ate 3g dried and it felt like 2g of other stronger mushrooms, which would not be that bad but after I got 113g fresh from the first flush, the 2nd flush only gave me about 50g and the third flush was one lonely mushroom... Maybe I just got unlucky, I'll try the Mondo GKs next in hope that there will be a higher yield... Review by Chris (Posted on 5/15/2020)

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Important information about FreshMushrooms® grow kit McKennaii

  • You have to be 18 years or older to order this product
  • This product has shipping limitations. See the additional information to find out where we don't ship.
  • When you place an order you declare that you are aware of the legal status of the ordered product(s) in your country and that you are allowed to receive and posses these.
  • The use of magic mushrooms is at your own risk, so make sure to be well informed about the use and their effects.
  • The price does not include shipment.
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