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Magic Mushroom Grow Kit Red Boy XL by Mondo®

“Boy, it’s Red alright”, is what people say when they first collect the spores from this cubensis strain. This beautiful grower with large, bell shaped hats allow collecting spores easily and is simple to clone the Red Boy. There is not reason why anyone shouldn’t try this cube. The Red Boy is a true marvel and very rewarding. Super big fruits with above average potency.

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Product Description

The Redboy is a mysterius mushroom strain. That has red spores and can grow very large. Read this interesting comment on the strain by a famous shroomry user: "

Monokaryotic Puerto Rico mycelium was allowed to crawl over the non-germinating original 20 year old redboy spores in a petri dish, resulting in a 50/50 cross between the redboy spores and the PR mycelium, without the original spores ever germinating, which they were no longer capable of after 20 years.

Rattlesnake venom was added to the agar after cooling to weaken both the cell walls of the spores, and the cell walls of the mycelium, allowing the nucleus from each to exchange genetic information between them. The experiment was duplicated with the offspring, resulting in a 75% pure strain, which was then released to the public."

Years of planning and testing has resulted in the next generation of Mondo® Red Boy XL magic mushroom grow kits. The  Red Boy XL grow kit is now even better than it ever was. Compared to the first generation of Mondo®XL magic mushroom grow kit, the next generation is improved with:

  • Larger yields, more mushrooms
  • More flushes*
  • Better resistance against contaminations
  • Different, but easier instructions


*some strains produce more flushes than others. The first three flushes are the largest.

Meet the new standard of easy grow kits

The Mondo® Red Boy XL magic mushroom grow kit is slightly different than the grow kits you may have used before. These are mainly 'under the hood' differences and are not easily seen.

Just like the previous and other easy mushoom grow kits, you do not need to use additional spores. During the laboratory process, the spores have developed in mycelium inside the substrate (the cake) in the grow box.

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 grow kit in the refrigerator (2°C to 8°C) for 2 weeks after productiondate. First, wrap the grow kit in a plastic shopping bag and close it well.


  • 1x grow box – This contains substrate with active mycelium (the cake)
  • 1x large grow bag – The bag has micron filters to keep contaminants out
  • 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 to use


    How to prepare the room and yourself before you begin

    • Close any open windows. Wind or draft may bring microorganisms that can contaminate the Mondo® 'Red Boy' XL 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 Mondo® 'Red Boy' XL 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

    1. Fill the box with fresh, potable water. Close the grow box well and let is soak for 12 hours.
    2. After 12 hours, pour the surplus of water out of the grow box.
    3. Place the grow box inside the large grow bag. The open end of the bag should point upwards.
    4. Remove the lid from the grow box. Rinse the lid, and store it in the ziplock bag for later use. Place the ziplockbag with the lid back in the carton box.
    5. Fold the open end of large grow bag twice; do not cover the micron filter.
    6. Place the paperclip on the fold, so the bag stays closed. Now the Mondo® 'Red Boy' XL Magic Mushroom grow kit is ready to grow.
    7. Place the Mondo® 'Red Boy' XL Magic Mushroom grow kit inside the carton box, on top of the ziplock with lid.



    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 Mondo® 'Red Boy' XL 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

    The day after you start the process you begin with misting. Open the grow bag by removing the paperclip. 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. Misting also vents fresh oxygen inside the bag. 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 16 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. Remove the mushrooms from the cake by taking hold of the base of the mushroom between thumb and index finger. Rotating your hand clockwise slowly, until the mushroom lets go. Do not pull out the mushrooms. This would risk damaging the mycelium and killing it. 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 large grow bag. Fill the box with fresh, potable water. Take the lid out of the ziplock bag 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 grow bag with micronfilter upside down to dry. Make sure to hang it upside down, so no micro organisms will access the bag. Many growers prefer to use new and unused grow bags after every flush.

    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 3 – 7 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 or 3 flushes out of a Mondo® 'Red Boy' XL Magic mushroom grow kit. If you are experienced in cultivating, you can get more flushes out of a kit.

    The end

    When no more mushrooms grow out of a grow kit after the second flush for at least three weeks, or when the Mondo® 'Red Boy' XL 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 Mondo® 'Red Boy' XL 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.002-RBOY-2100
    Weight (KG) 1.4000
    On Sale? No
    Alternative product: No
    Grow Kit type Mondo
    Difficulty Moderate
    Size Extra Large
    Species Psilocybe cubensis
    Origin United States
    Potency High
    Optimum cultivation temperature 24ºC
    Yield (from) 200 grams
    Yield (to) 800 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

    20 Item(s)

    per page
    Great growkit Review by Davide
    excellent growkit, from the first wash I collected more than 360 g of fresh mushrooms; unfortunately I couldn't make a second one because the kit got contaminated, but it was my fault and not the seller's. (Posted on 11/29/2022)
    Good Review by faf
    Good yield, but I would suggest to buy the regular size because the price to preformance is better.. (Posted on 1/10/2022)
    success Review by winter
    Mushrooms appeared after 3 weeks, and have thick white stems. They seem rather mild, but not sure if they may have been harvested too early. (Posted on 10/21/2021)
    Bra och snabb service! Review by carlos
    Hade lite problem med xl men fick snabbt hjälp och bra service. (Posted on 9/13/2021)
    super Review by Michal
    Really nice strain, now starts 6th grow ;) (Posted on 12/20/2020)
    Snabb leverans och bra service. Review by carlos
    Fin strain med stora svampar. Denna strain kan ta lite längre tid att komma upp än andra strains. Bra kundservice och snabb leveranstid. (Posted on 7/30/2020)
    No potency at all Review by Josy
    I had 3 boxes of red boy. One rot moldy right away. But they send me another Box. I had several boxes in the Last years and i also know how to grow from scratch.

    Yield was Medium. But compared to b+ and treasure Coast the RED Boy had NO potency. The mushrooms didnt turn blue and didnt had any effect. No Matter how many grams u ate. So i will not order them again (Posted on 6/18/2020)
    recommendable Review by Teytum
    love this strain and potency. (Posted on 6/9/2020)
    Grow good Review by Thibaut
    Redboy (Posted on 5/12/2020)
    ok but not greatest yield Review by Teytum
    ok but not the greatest yield.. potency of mushrooms is definitaely the best though (Posted on 5/8/2020)
    Unfortunately not satisfied Review by jukebox
    Sadly no pins after a month of waiting
    Left a ticket and customer service was nice enough to send me another box after assessing the problem.
    I've received the package and waited another 3 weeks for the new box to show results, but unfortunately none, not even 1 mushroom

    Worth mentioning this was not my first box and i've also grown my own from scratch. Had multiple boxes at the time, all kept in the same room and all had positive results, which leads me to the conclusion that it was something wrong with the Redboy

    I am very sorry to leave such a review, on my first orders i was very satisfied with the service, but lately i keep getting bad boxes so i'll start searching somewhere else
    (Posted on 4/20/2020)
    Good try Review by Frigate
    Good trip with a lot of visuals and feelings. Need to be careful of the dosage, The first 2 batches are by far the strongest, after that the effect is diminished.
    A good strand from the MMS shop bank, worth the try. (Posted on 10/26/2019)
    Could be much better Review by Aleks
    The 1st growkit I received from this website was the Red Boy XL, when I got the growkit, there was a little bit of mold during the 1st flush, that's why I also got a replacement kit later on, which is nice (it was red boy's again). During the 1st flush the all mushrooms were growing on the sides, without any pins on top, thought maybe the kit is broken or whatever, they told me to throw it out since I was getting a replacement one. When I got the 2nd kit, it was pretty much the same story without "mold"...all pins are growing from the sides, 0 from the top, the mushroom quantity is very small compared to any growkit I ever grew before. Not recommending these kits at all, the support could have been a little bit better, I've been waiting for multiple days for an answer aswell. (Posted on 10/25/2019)
    Great harvest and high Review by pier luigi
    I’ buying this often.
    Always a great multiple harvest, easy to look after.
    Strong high. (Posted on 4/17/2019)
    Slow but grate fruits Review by Bill
    Verry good strain sometimes takes over 1 month to fruit but well worth the wait magicmushroom shop are top class if you have problems just contact them there verry helpfull (Posted on 3/20/2018)
    crap Review by james
    crap service and crap product. nothing but side fruits after 4 flushes of ive had no more than 5 at a time. followed the instructions to the tee. asked for help and got nothing. really pissed off
    @Reply from MMS: Please contact our customer service for some advice about your kit. Sometimes our messages end up in your junk folder make sure to look there too :) (Posted on 12/23/2017)
    great quality Review by pier luigi
    easy, great harvest
    i buy it again and again (Posted on 12/11/2017)
    Excellent Review by Gippa
    I can highly recommend these mushrooms , they are really easy to grow , and are a fantastic trip , great visuals with eyes open and closed, I will be definitely buying these again , and the customer service and delivery time are second to none (Posted on 9/15/2016)
    Awesome Review by Sean
    I would recommend this to anyone who would like to have a good trip. They are easy to prepare and have quite a large harvest. Will buy again. (Posted on 9/2/2015)
    Very Nice Review by Nick N'Ame
    So far I've tried B+, PES Amazonian, and RBoy. RBoy are far the most potent for me, great visuals feeling and so on. Very large mushrooms and above average yields. Would recommend. (Posted on 6/10/2015)

    20 Item(s)

    per page
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    Important information about Mondo® Grow Kit Red Boy XL

    • 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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