Letterbox Monster Grow Kit

Who’s This Kit For

Won’t be at home? Letterbox Monster fits through any standard UK letterbox*.

First time growing mushrooms? This all-in-one makes mushroom growing as easy as an Ikea cactus!

Need enough mushrooms to share? Letterbox Monster produces plenty of mushrooms for its size (as much as our XL MycoBox Grow Kit!).

Want mushrooms fast? This is even faster than our MycMonster Grow Kit (and that’s fast).

*We call this the Letterbox Monster, not the Letterbox Miracle – if you’re ordering multiple of these and/or other stuff too, then it might not actually fit through a letterbox. But if you are ordering just this and a gourmet liquid culture syringe or two, then it will fit absolutely fine (as long as it’s a standard UK letterbox).

How Does A Grow Kit Fit Through A Letterbox?

Letterbox Monster is an all-in-one mushroom grow kit which we sterilise flat, with its substrate spread out evenly within a folded-over grow bag. This grow kit is suprisingly big, especially once fully unfolded / extended. From the post person’s perspective (or your flatmate), it just looks like a very large, thick envelope, but once opened the kit will extend to nearly twice the length of the envelope and contain as much substrate inside it as our XL MycoBox Grow Kit. You will also find inside the hygiene kit and your gourmet culture syringe (if you order one of those that is!).

Of course, once you’ve opened it all out and injected it, you can let the substrate drop to its gusseted ‘bottom’ and stand it vertically as normal. That will also be the way it’s fruited too, in the bag and sitting vertically (once it’s finished colonising with mycelium, that is).

Our Advanced Sterile Substrate A

Substrate A is one half of substrate B (which customers have been telling us is brilliant – it’s not just what we’re saying). The main reason we even made substrate B, was because we didn’t think customers were ready to accept a non-grain-based substrate as being any ‘good’, so we snuck grain in there too so it would be adopted easier. Truth is, our MycMonster wouldn’t be the monster it is if it weren’t for Substrate A.

Inoculation

You will see the grow kit bag is folded over, as soon as you peel this back to extend the bag fully you will have a large sterile area to inject your 6ml-12ml syringe anywhere you want. But, we recommend only peeling this back the moment you are ready with your syringe as you will never get a better, cleaner moment than this to inject (because it’s totally sterile).

We will still include an alcohol wipe for you to clean an area of the bag prior to injecting it, but it’s not really needed if you are peeling the bag back and immediately injecting it.

After you’ve injected the bag, you’ll cover the tiny needle hole with the included sticker. Then you just leave it all to colonise somewhere warm and in a week or two depending on mother nature and what you injected, the substrate could be completely white with mycelium!

So to summarise: Unfold / peel back the folded bag to reveal a fresh (sterile) surface, inject up to 12ml of solution from your gourmet spore or culture syringe and cover the hole your needle made with the included sticker. Leave somewhere warm to colonise.

Letterbox Monster Grow Kit Contents

• Grow Container: HEPA-Filtered Tall / Narrow Mushroom Bag
• Substrate: 1000mL of Sterilised Substrate A
• Fruiting: In Same Bag
• Sanitation: IPA Wipe, Hand Wipe, 18G Sterile Needle
• Online Instructions (coming within 24 hours)

Not Included

• Gourmet spore or liquid culture syringe – 12ml max

Helpful Advice

• Keep incubation temperatures between 20°C and 26°C
• Incubation temperatures of 26°C provides fastest colonisation results, but do not exceed this!
• Never place this kit on direct heat, like a heatmat
• We recommend inoculating your Letterbox Monster within 4 weeks of receiving it for the best results
• The specialised HEPA filters on the Letterbox Monster manage clean air exchange – please don’t remove them
• NEVER cut open the Letterbox Monster before it’s fully colonised by mycelium, or contamination may ruin the kit

Shipping & Legal

We ship from the UK to almost anywhere in the world. Each kit is made fresh to order and typically dispatched within our 3 working day aim (see our Shipping & Dispatch page for more info).

This product is for cultivating legal mushroom species only.