All the products we sell are legal in the Netherlands, please check the legislation in your country before ordering our product.

Our products are only suitable for adults.

Are you accept this?
Yes No

B+ XL Mycelium box (2100 ML)




This B+ XL mushroom kit is an improved mushroom kit with 80% more substrate than our medium sized mushroom kits. The B+ is probably the best known (mexican) strain and is in our top 3 best selling strains.


This XL mushroom box contains the mycelium of the Psilocybe cubensis 'B+' strain. The B+ mycelium is colonized on a substrate of rye and perlite. The top layer is covered with vermiculite.


Our online manual for the mushroom mycelium kit can be viewed at www.mushroomgrowbox.org.
here are no paperclips included in the boxes.


Holding the double of the substrate, meaning the double of the expected B+ mushroom yield, the XL-Mycelium box is an enhanced product allowing the formation of exceptionally big B+ mushrooms in an exceptional short amount of time. Growing massive magic mushrooms at home has never been easier


This new B+ XL kit highly reduces the probability of contamination and its simplicity of processes will allow you to better focus on the amazing formation of the magic mushrooms. The XL kit is made with the strongest mushroom strains, growing mushrooms was never easier and more reliable.



Because the kits are fresh we recommend to set them up right away.

Mushroom Stopper - Bad Trip Stopper

If this will be the first time you use magic mushrooms, make sure that a sober friend is around to help you out in case you feel uncomfortable, sick or scared. Click here to buy our Mushroom Stopper. Our Mushroom Stopper, it helps you to get out of your trip.



We do NOT ship to countries outside the E.U.

If in doubt, please contact us and we will inform you if we will ship these XL mushroom boxes to you!!!

Mushroom growbox manual


Step 1
Wash your hands thoroughly and clean the outside of the grow kit with a clean, damp cloth. Remove the lid, but keep it for step 3.

Step 2
Fill the kit with water up to the edge of the kit (20 º C). Place the lid and let the mushroom growkit soak for 12 hours ( if this is your second flush you let the kit soak for 8 hours).

Step 3
After soaking, remove the lid of the grow kit and carefully pour off the water, until the last drop.

Step 4
Add warm water (20 º C) to the grow bag.

  • For the 2100cc grow kit: 2 cups (0,5 liters)
  • For the 1200cc grow kit: 2 cups (0.5 liters)
  • For the 250cc grow kit: 1 cup (0.25 liters)

Put the grow kit in the grow bag. Make sure the water does not go over the edge of the grow kit.

Step 5
Close the growing bag by folding the top of the bag and secure it with one or two paperclips (part of the grow kit package).

Step 6
Put the grow kit in a place out of direct sunlight but enough daylight, and not on or near a heater or heat source. The ideal temperature is between 20 and 25 º C. Make sure there is sufficient sunlight.

Step 7
The first mushrooms will be visible in 10 to 12 days.

Step 8
The mushrooms should be harvested just before the skin underneath the hats starts to loosen up.
The harvest: grab the stem gently and turn the mushroom to the left and than to the right and gently pull. This way you can remove the mushroom as complete as possible. This way you can reuse the grow kit.


Enjoy your shrooms!

new flight
After harvesting, clean the surface of the grow and remove the old and dead mushrooms, so the new mushrooms have the ability to grow. Put the grow kit for the best results in the refrigerator overnight. Caution! Not colder than 2 ° C.

Start again from step 2 for the next harvest.



  • The ideal climate is 22 º C.
  • Work very clean!
  • When using a heating mat, make sure there is between the heating mat and the growkit. (1 cm) 
  • Don't use a heating mat for temperatures above the 20 degrees. 
  • Try to avoid mushroom spores on the substrate, it will kill the mycelium.
B+ XL Mycelium box (2100 ML)

For the first time, a grow kit didn't work out at all. To begin with, the set didn't look like it was fully colonized. I observed some mycelial growth, but despite doing everything right, not a single shroom grew, and after about 10 days it looked like there was some contamination (I sterilized the environment, used sterilized water, mask and gloves)... Very disappointing!
Evaluation: [out of 5 Stars]

(William )
Bon produit livraison rapide
Evaluation: [out of 5 Stars]

Ehrlich gesagt bin ich dieses Mal stinksauer !!!! ich kaufe schon etwas länger bei Avalon ein und habe zurzeit sehr wenig Geld trotz dessen hab ich eine Bestellung aufgenommen Mich gefreut und nur Mist zuhause die Box ist nur zur Hälfte gefüllt und war schon feucht WTF .. sowas hatte ich bei Avalon noch nie bin enttäuscht und für 50 Euro kann man ja wohl erwarten das wenigsten das Granulat vollständig und nicht durchgeführt ankommt. Fehler passieren aber vielleicht sollte man die Mitarbeiter mal checken anscheinend gibts da welche die das nicht gewissenhaft machen
Evaluation: [out of 5 Stars]

This was my First growkit.
After 5 flushes and 1000g fresh schrooms it is finished.

Evaluation: [out of 5 Stars]

Decent shipping, giant yield and man, what a nice trip.
Highly recommend.

Evaluation: [out of 5 Stars]

The grow has been pretty good so far. No enormous amounts but till now two decent flushes and the third is on the way. No problems with contamination at all. I also tried the dried mushrooms from the first flush and I found them quite potent for a cubensis strain.
Evaluation: [out of 5 Stars]

Meine Box war leider kontaminiert. Es hat sich nur Schimmel ausgebreitet. Trotz größter Vorsicht auf Reinheit kein Einziger Pilz.... Enttäuschend

Evaluation: [out of 5 Stars]

Got 2 of them after trying Golden Teachers. They're about 70-80% colonized, which is great for the prize. Each flush is about 25-30g dried for me. Great strain as well! Thanks.
Evaluation: [out of 5 Stars]

(julian Bishop)
The B+ XL Mycelium box arrived very swiftly and was easy to get started.
All it took was to soak the box with the impregnated mycelium for 12 hours and then transfer the kit to the grow bag with a little luke warm water added in the bottom of the bag.
Now I wait patiently, whilst mother nature does her work! :-D

Evaluation: [out of 5 Stars]

I have tried almost all of the strains on this page, and this is the fastest growing one. The only thing I dont like about it is a bit lesser potency. Good if you dont like waiting much.
Evaluation: [out of 5 Stars]

(Dahou Jean)
very fast delivery.mycelium in excellent condition.
Evaluation: [out of 5 Stars]