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McKennaii Supagro Grow Kit with 100% colonized substrate

The Mckennaii magic mushroom is a real tribute to McKenna, honor him with the fruits from this kit. Give the McKennaii form SupaGro a try! Fast growing ,strange growing and a real mystic mushroom.

The substrate of the myceliumboxes by SupaGro is 100% colonized. Big First flush of very potent magic mushrooms!

Availability: In stock

Product Description

The McKennaii magic mushroom grow kit is a product of the SupaGro company. This company redefines the way magic mushroom grow kits are produced. A whole newly developed method of producing these McKennaii magic Mushroom grow kits has been developed. This has resulted in magic mushroom grow kits that can proudly wear the name: SUPA!

When comparing McKennaii SupaGro magic mushroom grow kits to the standard magic mushroom grow kits, there are differences you should be aware of:

  • The first two flushes are Supa Large! Up to 300 grams under perfect conditions
  • The first flush comes faster. First results can be expected after only a few days till a week.
  • Substrate is 100% colonized by mycelium.
  • Very contamination resistant.
  • A totally new designed SupaBag with venting holes. The substrate with mycelium (also called cake) really needs to breath.
  • No perlite on the bottom.
  • The lid has venting/expansion holes.


McKennaii SupaGro Grow Kits look different than other grow kits

The McKennaii SupaGro magic mushroom grow kit is different than the grow kits you might have seen before. After opening the carton box you see it. In plastic lid, eight holes were drilled. These holes were part of the production process.

You might have received a McKennaii SupaGro magic mushroom grow kit with the lid partially opened up. Sometimes this happens during transport. This is caused by a combination of the production process on one hand and the mycelium trying to expand on de other. When the mycelium is so well developed, it might push the lid up creating small openings. Don't worry, when this has happened, just continue with the procedure. The mycelium is so strong and well developed by now, contaminants well have a hard time to infect your McKennaii SupaGro magic mushroom grow kit.

Don't test this by not working hygienically. We recommend always using surgical gloves or a good disinfectant when handling the kit. You should use a facemask to avoid breathing into the SupaBag and on the cake.

The SupaBag has holes

The SupaBag has two rows of holes. The top row is to let the oxygen in and the bottom row is to vent carbon dioxide out. There is no need to open the bag for ventilation as you might normally do with the standard grow bag with microfilter. When the SupaBag is placed correctly, this allows an optimal respiration gas balance for the mushroom growth.

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 the McKennaii SupaGro magic mushroom grow kit inside a Soaking Bag in the refrigerator (2°C to 8°C) for 6 weeks.


  • 1x SupaGro grow box – This contains substrate with active mycelium (the cake)
  • 1x SupaBag – The bag has 2 layers of punched holes for ventilation.
  • 2x paperclip – For closing the grow bag.


You need

    • A Misting Bottle 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 McKennaii SupaGro 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 McKennaii SupaGro 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.


    Starting the process

    Do not soak the McKennaii grow kit! This is not needed at this stage.

    1. Place the grow box inside the SupaBag. The open end of the SupaBag should point upwards.
    2. Remove the lid from the SupaGro grow box. Rinse the lid, dry it and store it in the carton box for later use.
    3. Fold the open end of SupaBag twice; do not cover the venting holes.
    4. Place the paperclips on the fold, so the bag stays closed. Now the McKennaii SupaGro Magic Mushroom grow kit is ready to grow.
    5. Place the McKennaii SupaGro Magic Mushroom grow kit inside the carton box, on top of the lid.



    The ideal temperature is 24°C. Do not have the temperature drop under 18°C and not exceed 29°C. SupaGro does not recommend using an heating mat with their magic mushroom kits. Using a heating mat is at your own risk, no guarantees can be given.


    The McKennaii SupaGro 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.

    Water / Misting

    Misting should be started with on the day that the first mushrooms (pins) appear. Open the grow bag by removing the paperclips. Do not spray directly on the cake, but spray one time against every side of the bag. So you mist once a day, four sprays but only when the mushrooms are visible. Right after misting, close the bag again with the paperclip.


    If the conditions are optimal, you can expect the first small mushrooms (the pins) to appear between 5 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.


    After all the mushrooms have been picked, you prepare the kit for the next flush. Again, with disinfected hands or gloves; take the grow box out of the SupaBag. Fill the box with fresh, potable water. Take the lid out of the carton box and use it to close the grow box. Place the closed grow box in a soaking bag or use your own clean plastic shopping bag and wrap it around the box. Close it well and place this in a refrigerator (2°C to 8°C) for 12 hours. This is called the soaking process. Water will now soak through the cake, preparing it for the next flush.

    During the soaking you can hang the SupaBag upside down to dry. Make sure to hang it upside down, so no microorganisms will access the bag.

    After 12 hours take the soaking bag with the grow box, out from the fridge and unpack it.

    Next Flush

    To continue, follow the same steps 1 – 5 as before when you started the process for the first time. Several days later, a new flush will appear. You can get at least 2 large flushes out of a McKennaii SupaGro Magic mushroom grow kit. If you are experienced enough in cultivating, you can get more flushes out of a McKennaii SupaGro Magic mushroom grow kit. Up to 8 flushes!

    The end

    When no more mushrooms grow out of a grow kit after the second flush for at least three weeks, or when the McKennaii SupaGro 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 McKennaii SupaGro 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 sg-mck
    Weight (KG) 1.0000
    Alternative product: 792
    Grow Kit type SupaGro
    Difficulty Easy
    Size 1200cc
    Species Psilocybe cubensis
    Origin N/A
    Potency Average / High
    Optimum cultivation temperature 23ºC
    Yield (from) 200 grams
    Yield (to) 600 gram
    Water Spray Needed Yes
    Not shipped to: Non EU countries, Africa, Asia, Australia, Caribbean, Central America, Cyprus, Germany, Iran, Middle East, South America, Canada, Estonia, Finland, Israel , New Zealand, Norway, Russia, Switzerland, Turkey, United Kingom, United States
    Customer Reviews (9)
    These grew very fast and a few flushes. Very pleased with this batch and I highly recommend .
    Review by CANDY (Posted on 1/11/2019)
    With this kit I got 32g of dried mushrooms, with 3 flushes.
    I had some problems from the second flush: some white fluff and little back mosquitos but I think it's due my lack of attention to hygiene.
    Tried 3.5g, very good trip: large headspace with strong body load.
    Review by Federico (Posted on 12/3/2018)
    Brilliant product. Brilliant Customer services
    Having tried several of these sites this one is definitely the most professional and impressive. Can't fault them one bit. After my initial batch floundered due to horrible green mould they sent me a new one free of charge. I shall be using these guys again. Thanks! Review by AK2 (Posted on 8/10/2018)
    Half of them grown
    Half of box just grown perfect but half of them are dead and I don't know to eat them or are they infected .. I want to be a customer and I want to buy another boxes . For first what to do eat them or no .?
    [mms edit: Hello Filip, before you eat anything please contact customer suppoert ASAP with clear photos and descreption of the kit, color and odor! ^IQ]
    Review by Filip (Posted on 7/31/2018)

    Great strain.

    The 1st flush is quite good under optimal condition (proper ventilation).
    Review by J (Posted on 7/20/2018)
    Good flushes & exhilarating trips
    I've ordered this mushroom growkit on the 4th of march. The kit was delivered very fast on the 5th of march, and I started on the 6th of march.
    After I had received the kit I immediately placed it in the bag and never opened the bag again (to spray the sides with a mistbottle for example).
    Within 16 days I could harvest the 1st flush on thursday 22th march 2018, the harvest was 160 grams.

    Then after soaking the growkit for 12 hours, I put it back in the bag for the growing process. After 10 days I could harvest the 2nd flush, which was 140 grams.
    In these two flushes there was a total of 300 grams of McKennaii mushrooms! :)

    The trips were really amazing, exhilarating and exquisite!
    The visuals were beautiful and there was a constant great bodybuzz-feeling!!
    (I loved watching MTV a couple of trips, we laughed ourselves silly with things like "Ex on the beach" :P)

    The only 'minor' downside of the growkit was that the mushrooms only grew at the sides of the kit (there grew no mushrooms in the middle of the kit for some reason).
    Maybe it was because of how it was delivered, or how the spores were ingested in the kit (I simply don't know).

    But all-in-all, I'm very happy with the yield of the two flushes (after these two flushes, I threw the kit away with the organic disposal).
    It was all "fun-and-giggles" and I will definitely be ordering more of these mushroom growkits! ^^
    Review by Psychomush (Posted on 4/8/2018)
    Fast growing & rewarding experience
    I've collected 35 grams of dried mushrooms so far in two flushes. (Note that this review is for a fresh mushrooms grow kit that I got as a replacement of a contaminated supaGro one).

    Last Saturday I ate 2.5 grams, in a dark room alone with music. I've never tried mushrooms before, although I've had multiple experiences with other psychedelics. They took me where I was expecting to. Powerful medicine, really.


    Oh, and they tasted good also!
    Review by Marcos (Posted on 3/16/2018)
    BOOM! *****
    Never had a trip like this. As if the spirit of the man was in these shrooms!. Long visual trip some good energy vibes. Try this kit it will space you out Review by wes (Posted on 3/6/2017)
    BEst Mckenna ever
    kit ship very fast at home. grow mushooms in a week. mckenna gives a good trip Review by Joha (Posted on 3/6/2017)
    Write Your Own Review

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    Important information about SupaGro® 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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