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Fresh Mushrooms Grow Kit McKennaii, 1200 ml
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Fresh Mushrooms 1200 ml magic mushroom grow kit with the McKennaii strain of Psilocybe cubensis, delivered fully colonized: no spores, no soaking, just place it in its bag.
- The most visual strain in the range, according to the manufacturer (overall rating 4.5 / 5)
- About 500 g of fresh mushrooms in total, according to the manufacturer
- A little more delicate: ideal after a successful first kit
Psilocybe cubensis · Fresh Mushrooms · 1200 ml
McKennaii: the visual strain named after Terence McKenna
The Fresh Mushrooms McKennaii kit is a 1200 ml container of fully colonized Psilocybe cubensis: a magic mushroom grow kit that is ready to fruit as soon as it goes into its bag.
The manufacturer presents it as a recent strain and one of the most intense in its range, with the highest overall rating (4.5 out of 5) and top marks for visuals. It is a little more delicate to grow than the others, which makes it a good choice once you have already succeeded with a first kit.
- Ready to grow
- Highly visual profile
- Manufacturer rating 4.5 / 5
- Stated yield ≈ 500 g
- Species
- Psilocybe cubensis
- Strain
- McKennaii (XP range)
- Manufacturer
- Fresh Mushrooms, Netherlands
- Volume
- 1200 ml, fully colonized
- Stated yield
- ≈ 500 g fresh in total, several flushes
- Level
- Intermediate
McKennaii profile and effects
With McKennaii, Fresh Mushrooms promises “a powerful visual and intensely philosophical trip”. It puts the strain joint top of its range with Golden Teacher (4.5 overall) and gives it 5 out of 5 for both visuals and introspection. Growers' reports point the same way, describing strong visuals and sometimes more nausea at the start.
These ratings are reference points drawn from experience: no published lab data compares McKennaii with the other strains. If it is new to you, start at the bottom of the dosage ranges.
- Visuals5 / 5
- Creativity3.5 / 5
- Introspection5 / 5
- Intensity3.5 / 5
- Overall rating4.5 / 5
Ratings published by Fresh Mushrooms for its XP range, out of 5. These are the manufacturer’s ratings, a guide not a measurement: no independent analysis compares these strains with one another.
Terence McKenna and the origin of the strain
Terence McKenna (1946–2000) is one of the great figures of psychedelic culture. In 1971, he and his brother Dennis explored the Colombian Amazon near La Chorrera, where they found large Psilocybe cubensis. In 1976, the brothers published Psilocybin: Magic Mushroom Grower’s Guide under pseudonyms (O.T. Oss and O.N. Oeric), one of the first growing manuals written for a general readership.
The origin of the McKennaii strain itself is disputed. One version traces it to a spore print from McKenna’s collection; another credits a Dutch grower who supposedly named it in his honor. According to mycologist Caine Barlow, genetic analyses support the second version and place the strain very close to Golden Teacher. Nothing suggests McKenna ever grew it himself.
The kit and how to set it up
What’s in the box
A 1200 ml container fully colonized with mycelium (100% Mycelium XP range), its lid, a microfilter grow bag and 2 closing clips to seal it.
Ready to start
No spores, no injection, no soaking: the first cycle starts as it is, as soon as the open container goes into its bag.
The right conditions
Between 18 and 28 °C, ideally around 23 °C, in bright, indirect light but never direct sun. Keep it away from radiators and drafts.
The steps at a glance
- Prepare a clean workspace. Wash your hands and forearms, clean the surface and keep drafts to a minimum.
- Open the kit, but do not add water. Remove the seal and the lid; rinse the lid and keep it for later.
- Slide the open container into the bag. Fold the top of the bag down and tuck it under the container, with the microperforations above the substrate.
- Wait without opening or misting. The first pins often appear within 7–14 days: a guide, not a guarantee.
- Stand the bag upright and close it with the clips as soon as the first pins appear, then loosen the top slightly once the caps have formed.
- Harvest before the spores drop, when the veil under the cap starts to tear: gently twist and pull at the base.
The step-by-step setup guideEvery step in detail, plus troubleshooting and how to rehydrate the kit between flushes. Read it once from start to finish before you open the box.
Read the guideHarvest and yield
According to Fresh Mushrooms, a 1200 ml kit gives several harvests (flushes) totaling about 500 g of fresh mushrooms. That is the manufacturer’s figure: a living culture varies, and neither the number of flushes nor the weight is guaranteed.
Between flushes, you rehydrate the kit: fill the container with clean cold water, put the saved lid back on and leave it in a clean bag in the refrigerator (2–8 °C) for about 12 hours. Drain the water, remove the lid and start again from the bag step.
| Stage | When | Notes |
|---|---|---|
| Setup | Day 0 | No water, open container in its bag |
| First pins | Often 7–14 days | About one week, according to the manufacturer |
| First harvest | About one week after the pins | Before the spores drop |
| Further flushes | After 12 hours of rehydration | Several cycles possible, according to the manufacturer |
The effects in general
Psilocybe cubensis mushrooms contain psilocybin, which the body converts into psilocin. According to the Trimbos-instituut, the Dutch national institute for mental health and addiction, perception intensifies: brighter colors, rippling shapes, altered sounds, shifting emotions, laughter, relaxation and a distorted sense of time and space. At high doses, the senses can merge (synesthesia).
The body reacts too: dilated pupils, chills, sweating, a rise in heart rate and blood pressure, and often nausea or a heavy feeling at the start (the “body load”). How it unfolds depends heavily on the amount, your state of mind and your surroundings, known as set and setting. A difficult experience, with anxiety or confusion, can happen at any time.
| Phase | Typical timing |
|---|---|
| Onset | 20–60 minutes after taking |
| Peak | About 1–2 hours after taking |
| Duration | 3–6 hours, depending on the source and the amount |
| Afterward | Possible tiredness; no driving for the rest of the day |
Dosage: the reference points
Dutch harm-reduction organizations give ranges for Psilocybe cubensis. Unity (Jellinek / Arkin) says people most often take 15–30 g of fresh mushrooms, or 1.5–3 g dried, and about 7 g fresh for a first time. Dried mushrooms are roughly ten times more concentrated than fresh ones.
| Level | Fresh | Dried | Who it’s for |
|---|---|---|---|
| First time | about 7 g | about 0.7 g | To find out how sensitive you are, with a sober person present |
| Light | 5–10 g | 0.5–1 g | Clear effects that are easy to manage |
| Common | 15–30 g | 1.5–3 g | The most frequently cited range |
| Strong | more than 30 g | more than 3 g | Experienced users only: the risks rise sharply |
Why start low
Psilocybin content varies widely from one strain, one flush and even one mushroom to the next: up to fourfold between flushes of the same culture (Bigwood and Beug, 1982). Grams are only a rough guide.
Fresh Mushrooms claims its XP kits contain on average twice as much active substance as other brands. No analysis has been published, but to be safe, start at the bottom of the range and wait at least an hour before considering more.
Reducing the risks
- Not if you have a personal or family history of psychosis or bipolar disorder, or during a period of severe anxiety or depression.
- Medication: never with lithium (risk of seizures) or an MAOI antidepressant (risk of a hypertensive crisis). If you take an SSRI, tramadol or any other medication, ask a doctor or pharmacist first.
- No alcohol, cannabis or other drugs at the same time: the experience becomes heavier and less predictable.
- A calm, familiar place and a trusted person who stays sober (a tripsitter).
- A light stomach: two to three hours after a meal, nausea is less intense.
- Don’t redose too soon: the effects can take up to an hour to come on.
- Don’t drive, and plan nothing important for the rest of the day.
- Space out your sessions: tolerance builds quickly.
- Never eat mushrooms from a questionable kit: if you see green, black or brightly colored mold, consume nothing.
- If someone feels unwell or the anxiety will not pass, call emergency services (112 in the EU) and say what was taken.
Specifications
| Brand | Fresh Mushrooms (Netherlands) |
|---|---|
| Species | Psilocybe cubensis |
| Strain | McKennaii |
| Range | 100% Mycelium XP |
| Volume | 1200 ml of fully colonized substrate |
| Contents | Container with lid, microfilter grow bag, closing clips |
| Temperature | 18–28 °C, ideally 23 °C |
| First pins | Often 7–14 days |
| Stated yield | About 500 g fresh in total over several flushes (manufacturer) |
| Level | Intermediate |
| Guide | Fresh Mushrooms setup guide |
| Sale | Only to customers aged 18 and over |
The other Fresh Mushrooms strains
Same 1200 ml box, same setup: only the strain changes. Compare them all on the Magic mushroom grow kits page.
Discreet delivery
Orders are prepared on business days and shipped in plain outer packaging that does not describe the contents. Once your order has shipped, the tracking link is emailed to you when available. Delivery estimates, your right of withdrawal and its exceptions: Delivery, tracking and returns.
Sources: DoubleBlind, “McKennaii mushrooms”, 2024; Fresh Mushrooms, manufacturer (microdosingxp.com); Trimbos-instituut (drugsinfo.nl); Jellinek; Unity (unity.nl); Talk to FRANK; Bigwood and Beug, Journal of Ethnopharmacology, 1982; Nayak et al., Pharmacopsychiatry, 2021. Updated 3 October 2026 by the Mycotrop team.
Frequently asked questions
Did Terence McKenna create the McKennaii strain?
Not as far as we know: it carries his name as a tribute. Its origin is disputed, but the genetic data cited by mycologist Caine Barlow point to a Dutch grower and a close relationship with Golden Teacher.
Is McKennaii stronger than other strains?
It is the manufacturer’s highest-rated strain (4.5 out of 5), alongside Golden Teacher, and the most visual according to the manufacturer. No published analysis confirms this, and potency varies widely from one flush to the next, so treat it with caution.
Is McKennaii good for a first grow?
According to the manufacturer, it is a little more delicate. If this is your very first kit, Mexican, Ecuador or Golden Teacher are more forgiving; the setup is the same across the whole range.
What is the difference between McKennaii and Golden Teacher?
The manufacturer gives them the same overall rating (4.5 out of 5). McKennaii is rated more visual and is a little more demanding to grow, while Golden Teacher is easier and faster.
How much should I take the first time?
Harm-reduction guidance suggests about 7 g of fresh mushrooms (0.7 g dried) to find out how sensitive you are, with a sober person present. Wait at least an hour before considering more: potency varies from one mushroom to the next.
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Expected dispatch: Tuesday, October 13, 2026.
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