You have no items in your shopping cart.
Jack Frost — Cloud920® Ready-to-Grow Bag
Jack Frost is the most potent Psilocybe cubensis in our catalogue — a deliberate cross between True Albino Teacher and Albino Penis Envy, bred by Dave Wombat in 2018. Snow-white mushrooms, flat caps that curl upwards, and a psilocybin content of 10–12mg per gram: this strain is reserved for growers who are ready for it.
First pins typically appear between 3 and 5 weeks. This is by design. Adjust your dose accordingly.
Availability: In stock
€45.00
Related
Check items to add to the cart or select all
Product Description
Details
Jack Frost is not for the impatient — and that's exactly why it has a cult following. This snow-white Psilocybe cubensis is the strongest cubensis in our catalogue, bred for extraordinary potency and a frosty appearance unlike anything else you have grown. It takes its time. It rewards patience. And once it fruits, it does not disappoint.
Part of the Cloud920® Genetic Series — Hybrid Fusion
Origin & Genetics
Jack Frost is a deliberate cross between two albino legends: True Albino Teacher (TAT) and Albino Penis Envy (APE). From TAT it inherits reliable yields, strong flush potential, and a forgiving temperament. From APE it inherits its concentrated potency and slow, methodical growth. The result is a strain that looks like both parents — fully white, frostbitten stems and caps that curl upwards like snowflakes — and hits harder than either of them alone.
Why Choose Jack Frost?
- Strength: ★★★★★★ (6/6) — the strongest cubensis we carry. Even experienced users recommend starting low at 1–1.5g and working up from there.
- Documented genetics — unlike most cubensis whose origins are folklore, Jack Frost has a traceable breeder and verified parentage. You know exactly what you are growing.
- Multiple heavy flushes — expect 400–800g fresh across multiple flushes from one kit.
- Built for the bag format — Jack Frost's slow colonisation style suits the sealed Cloud920 bag perfectly. Minimal intervention, maximum result.
⚠️ Jack Frost takes longer than most strains — and that's a feature, not a bug. First pins typically appear between 3 and 5 weeks after setup. This is not a sign of a failed kit. Jack Frost grows slowly because it puts its energy into density and potency rather than speed. Growers who stay patient are consistently rewarded with heavy, thick-stemmed flushes. If you're at week 3 with no pins yet: you're exactly on schedule.
What's in the Box
- 1x Cloud920 Grow Bag — 2000cc pre-colonised substrate with active Jack Frost mycelium. Integrated micron filters provide passive air exchange and contamination protection.
- 1x Large bag clip — to seal the bag securely between ventilation sessions.
- 1x Rubber band — place around the substrate block to prevent unwanted side growth.
How the Cloud920 Grow Bag Works
- Open once — fold the bag open in a clean space to allow fresh air in and trigger pinning.
- Place and wait — put the bag in indirect light at 23°C. No soaking, no misting required in the first phase.
- Air daily from week 2 — briefly open and refold the bag once a day to encourage pin development.
- Harvest and repeat — twist and pull mushrooms at the base before caps open fully. Rehydrate and repeat for additional flushes.
Instructions
The Cloud920 Ready-to-Grow bag does not include printed instructions. Find the full step-by-step guide here: Cloud920 Grow Bag Instructions.
Additional Info
Additional Info
| Productcode | MCS.GKC920.JFRO-XL |
|---|---|
| Weight (KG) | 1.4000 |
| Mushroom Strain | Jack Frost |
| Brand | Cloud920® Grow Bag |
| Difficulty | Very Easy |
| Size | Extra Large |
| Species | Psilocybe cubensis |
| Origin | United States |
| Potency | High |
| Optimum cultivation temperature | 23ºC |
| Yield (from) | 200 grams |
| Yield (to) | 800 gram |
| Water Spray Needed | Yes |
Customer Reviews
- What a team! Great guys Review by maria
-
"I'll start by saying that I’m quite new to cultivation, and the team has guided me step by step throughout my journey. One of my first cultivation bags was contaminated due to my mistake, and the team promptly sent me a replacement Thank you very much for your support and for being patient with me. I’m now going to try my first round in the mountains. Thank you, mushroom team! (Posted on 3/12/2026)Rating - Very happy overall Review by Traveller
-
The first kit totally failed but the support sent us a new one and helped (Posted on 1/23/2026)Rating - Great potency, easy to grow. Review by Steven
-
These are a must. So easy to grow. Not the biggest harvest but the mushrooms are huge and the potency makes up for the smaller harvest. I will definitely be buying more. (Posted on 1/16/2026)Rating - Slow but steady Review by Ivan
-
Very slowly grower, worth waiting (Posted on 1/14/2026)Rating - Good results Review by Mark
-
My first ever grow, took 3.5 weeks to start but it was very goodRating
Strong and good yielder (Posted on 12/24/2025) - Slightly Disappointed Review by Miguel
-
I’m a bit disappointed with the Jack Frost Cloud 920XL so far. The mycelium looks very healthy and strong, which initially made me quite excited. However, after 4 weeks, the mushroom growth has been very slow. Up to now, only two mushrooms have developed to a reasonable size, and the others are still very small with no significant progress.Rating
I’ve been opening the bag about once a month to try to stimulate growth, but unfortunately the results are still below my expectations. Overall, I was hoping for a more consistent yield from this product. (Posted on 12/7/2025) - Jack Frost - Great Product Review by C-Mush
-
Overall a very good product. Very easy process, keep and eye out for water build up and empty if needed. Great results and multiple flushes! (Posted on 12/7/2025)Rating - 10/10 Best of what i tried Review by Sulla
-
I really do recommend to purchase here, great support and shipping will buy again. (Posted on 11/19/2025)Rating - All good Review by BlueWizard
-
All good so far, but this is one for the patient cultivators. Jack frost is notoriously known for its slow pinning but it pays off as the strain is very potent. Mine just started pinning after weeks of waiting. Can't wait till they mature and harvest! Thank you MMS for your amazing service. (Posted on 11/19/2025)Rating - Awesome Review by MG
-
I have bought a couple times from mms now and the products are always amazing, the troubleshooting is immediate and the products are TOPRating
I started this kit since 3 weeks and no fruits yet but JF are tipically slow to fruit and grow but the mycelium is looking healthy and I just can't wait! Of course some grow kits are not going tò be perfect but the MMS customer care will solve everything for you!
Buy once, buy always from them
Thanks MMS (Posted on 11/12/2025) - easy to use Review by Matjaž
-
It took 14 days to reach the first pins, then I waited 11 days for the first harvest, which yielded 110g of wet mushrooms. Now I’m drying them and hoping the second flush will appear soon.Rating
(Posted on 11/11/2025) - Not as much as hoped Review by Dan
-
My only complaint would be that the kit doesn't seem to yield as much as expected, I'm still hoping for a third flush to get a little more out of it.Rating
Support has been great though, they really seem to care :) (Posted on 11/5/2025) - Great medicine Review by Bitok
-
Great medicine, very good ! Initially crops were bigger but nevertheless they’re great! (Posted on 10/31/2025)Rating - happy with everything. Review by Sorongil
-
Aw a 1st time grower, made some mistakes at the begining stages, contacted the support, and I can't say enough praise for those guys. By following their advice, I managed to save 80% of the order. Deliver is fast and reliable to the max. Definitely ordering again since yield and potency were excellent after all the mistakes I made. Can't wait to write a review again once I do it right from the start, it's actually happening right now since they even sent me a replacement for a suspicious bag of Jack, but even that bag yielded some, and the replacement bag is progressing real nice now that the conditions are tweaked with the help of the support staff here. (Posted on 10/30/2025)Rating - Quick delivery Review by Richard
-
Thanks for the waffle nice touch!! Product is good (Posted on 10/30/2025)Rating - Top strain and great service Review by Thomas
-
I had a couple of those. I only had one that did not work and it was replaced as M-M-S customer service is great. The others worked as expected, yielded good and had it's effects as specified. A little more intense than standard cubensis with a deeper insight and transformation qualities. (Posted on 10/26/2025)Rating - Beautiful! Review by Yanou
-
Very easy to grow and very resistant to molds!Rating
I have used no clip to spray it lightly once every 2 days and to give it more air exchange once a day.
Vigorous mycelium which is taking his time for fruiting but the result is great!Maybe a good idea to get it in a monotube!
A very big thanks to Lottie for her kindness when you have a problem!
This is the place! (Posted on 10/23/2025) - The first one didn't meet expectations Review by Toni
-
I bought my first kit and my hopes and expectations were high. I read the instructions and reviews carefully and my expectation was that in 2-3 weeks the mushrooms would start growing and in 3-4 weeks I could harvest. However, after 3 weeks there was no sign of the mushrooms and then I started giving them air once a day and kept the kit in the fridge for one night. Then after 4 weeks the first pin was born. Now after 5 weeks and 3 days I harvest 123g of wet mushrooms. The support team has been great throughout the whole process, but my expectations were not met in the end result, which I am a little disappointed about. Maybe the Jack Frost growing instructions could have been written that it is quite normal for the variety in question to grow for 5-6 weeks, as support told me during the process. However, I have already ordered the next kit, albeit a different variety. (Posted on 10/21/2025)Rating - Slow and strong Review by Stray
-
Slow growth but strong effect and big fruits. (Posted on 10/15/2025)Rating - Great Albino Medicine Review by vitor
-
Great and profound mushrooms, initially crops were bigger now I’ve noticed they don't produce as much but, nevertheless, it has been ok! I love them! be careful with dosage, for me they are not for recreational use but yes for cerimonial use! (Posted on 9/2/2025)Rating
Important information about Jack Frost — Cloud920® Ready-to-Grow Bag
- The purchase of this product is restricted to individuals who are at least 18 years old.
- By initiating a purchase, you confirm knowledge of and compliance with the legal terms regarding the product(s) in your country of residence, as well as your eligibility to acquire and hold them.
- Shipping restrictions apply to this product. Refer to Additional Info to discover our non-delivery zones.
- Engaging in the consumption of magic mushrooms is solely your responsibility, so be certain to thoroughly educate yourself about their usage and consequential effects.
You may also be interested in the following products:
