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29.9559.95 incl. VAT

1200ml mycelium grow box, ready for mushroom cultivation.

Yield: up to 500g of fresh magic mushrooms (50g dry)

  • Easy cultivation
  • Moderate to potent mushroom strength
  • Highly popular strain
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Nidavellir – McKennaii


McKennaii is a famous strain of magic mushrooms named after the psychonaut Terence McKenna.

He was an American ethnobotanist, mystic, psychonaut, lecturer, author, and an advocate for the responsible use of naturally occurring psychedelic plants.

The McKennaii strain tends to produce thinner and larger mushrooms than other strains that are however highly potent.



The Product

Includes verything you need to grow potent Magic Mushrooms:

  • 100% mycelium grow box for mushroom cultivation.
  • Cultivation bag with HEPA filter against contamination
  • paper clip to close the bag



  • For the 280cc growbox up to 150g fresh magic mushrooms (15g dry)
  • For the 750cc growbox up to 280g fresh magic mushrooms (28g dry)
  • For the 1200cc growbox up to 500g fresh magic mushrooms (50g dry)
  • For the 2100cc growbox up to 900g fresh magic mushrooms (90g dry)


As a natural product, there’s no guarantee as to the yield of your growbox.
Fluctuations in temperature or any type of radiation can damage the mycelium.
Do not store for more than a few weeks before use. No refund or exchanges.




–  Cultivation difficulty: Easy
– Substrate: Manure, PF TEK, various grains
– Potency: Moderate
– Colonization time: 12 – 14 days
– Colonization temperature: 28 – 30 Celsius
– Fruiting temperature: 18 – 27 Celsius

The growbox can be put to use as soon as it arrives. Place in a warm and shaded location, read the instruction PDF!

Depending on the circumstances, mushrooms will start sprouting after 4-14 days. One box yields 3 or more flushes.

Please download and read the growing instructions!



About the McKennaii Mushrooms

In the community of mushroom friends, McKennaii is highly revered for its strong visuals.

It is rumored to be somewhat delicate to grow, but this can be circumvented by sticking to the prescription for an ideal growing environment.

Psilocybe Cubensis is actually the easiest to grow of all mushrooms, including culinary or medicinal mushrooms. The perfect candidate for anyone who wants to experience the joy of growing mushrooms and the power of healing and insight they offer.

Main psychoactive compounds: Psilocybin, Serotonin, Baeocystin

For further information, please read Set and Setting of a Psychedelic Experience




We are doing our best to ship in a stealthy way so that you receive your growbox without problems.

McKennaii Mushroom mycelium boxes do not contain psilocybin, nor mushrooms at the time of arrival. Only after further steps are done and the mushrooms start growing.



About Nidavellir (also Svartalfheim)

Nidavellir is the home of the Svartalfar (“black elves”) and is unfortunately only scarcely described in old sources.

These mythical beings are better known to us as dwarves and yes, think Lord of the Rings dwarves: Beards, mines and the world’s finest smithing.

In fact, dwarves are said to be such skilfull craftsmen that they made all of the finest weapons and trinkets the gods own, such as Thor’s hammer Mjolnir.


But why the strange product names?

Shopping with us means a neutral invoice for you, so that your Paypal or Bank account transfers won’t reflect your interest in mushrooms or truffles.
With us, you can simply make it look like you’ve been nerding out on nordic mythology. We really value privacy.

Weight 1 kg
Dimensions 22 × 15 × 9 cm


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