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A close look at the top of the sealed grow tub in the XL Cylocybe Special MycBox, its bed of coarse vermiculite behind two white filter strips and five black rubber injection ports, resting on the bag of perlite with the gloves, mask and wipes alongside
The Grow Kit version of the XL Cylocybe Special MycBox seen from the side, its sealed tub of dark substrate resting on the bag of perlite, with the liner bag, nitrile gloves, face mask, alcohol and chlorhexidine wipes and a sterile syringe laid out in front
Everything included in the Grow Kit version of the XL Cylocybe Special MycBox, laid out together: the sealed grow tub with its filter strips and injection ports, a bag of perlite, a liner bag, nitrile gloves, a face mask, alcohol and chlorhexidine wipes, and a sterile syringe
An XL Cylocybe Special Mushroom Grow Kit sealed inside its sterile bag on a steel bench, in front of a laminar flow hood filter
Gloved hands holding an XL Cylocybe Special Mushroom Grow Kit, its lid showing two HEPA filter strips and black rubber injection ports
An XL Cylocybe Special Mushroom Grow Kit on a steel bench, white mycelium visible spreading through the substrate
The underside of an XL Cylocybe Special Mushroom Grow Kit, white mycelium rosettes spreading out from each injection point
A colonised substrate block lifted out of its tub, solid white mycelium below a layer of dark casing
An even bed of hydrated perlite spread across the base of a Cylo Grow Tent, held open from behind

Cylocybe Special MycBox Grow Kit

(76 customer reviews)

Price range: $32.50 through $46.50

Used to be named "XL Cylocybe Special MycoBox Grow Kit", but a shop who first used the name for a different kind of grow kit has asked us not to use it.

This is still our same legendary kit that taught half the UK how to grow their first ever flush of mushrooms (and their second and third).

Enjoy.

Updates: Sat, 5th September: Now includes sterile gloves.

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Cylocybe Special MycBox (Grow Kit / Standalone)

Offered as standalone (without all the extras) or a as the complete mushroom grow kit with everything you need (except for the gourmet syringe).

Complete grow kit

  • All-In-One MycBox Grow Kit with everything you need included
  • 1.2 Litres Rye Grain, Millet, Vermiculite, Coir, Gypsum (and a Coffee punch)
  • Sterile, HEPA-Filtered and Ready to Inject
  • Grow tent to fruit your mushrooms inside
  • Chlorhexidine Alcohol Wipe for wiping the 5 injection ports
  • Antimicrobial Hand Wipe
  • Sterile Needle (18G / 1.5" / Agani)
  • Facemask
  • Optional Sterile Gloves (New as of 5/9/2026)
  • 2 Litres Perlite to maintain peak humidity levels throughout fruiting
  • Online Guide

Standalone (MycBox only)

Choose to buy this standalone if you already have your own setup.

  • Sterile, HEPA-Filtered and Ready to Inject
  • 1.2 Litres Rye Grain, Millet, Vermiculite, Coir, Gypsum (and a Coffee punch)
  • Chlorhexidine Alcohol Wipe for wiping injection ports
  • Antimicrobial Hand Wipe
  • Sterile Needle (18G / 1.5" / Agani)
  • Facemask

Grow tent

How do you use the tent?

You snip a small hole along the crease of each side of the tent, then feed through a little bit of filter - this filter is laser cut and precise (meaning repeatable results every time). But, don't go too crazy with FAE holes, as the more you create the more humidity you lose. You want to start small with just one hole on each side at the substrate level, then work your way up by watching your mushrooms and observing what they're telling you... Thin stems, "fuzzy feet"? Add more FAE holes and filter them. Dry tent walls? Lower the FAE by plugging some holes with tape. You observe and you adjust.

Perlite tips

We have always recommended draining the water off perlite before putting it into the tent. No change there, we still recommend it. But once the damp perlite is poured into the tent, we recommend pouring two cups of water in on top. The main reason is that it makes your life easier later, if things ever start to look dry then all you need to do is put your hand to the bottom and turn the damp perlite over so it sits on top. It's a real time saver. BUT, be extra careful not to touch your cakes. It likely won't be the cleanest water, so treat it that way. Extra brownie points for the customers who pour a little 3% hydrogen peroxide in every couple of days - a bottle of 12% goes a long way in this hobby when you are diluting it and I've found myself using it for everything from defeating cobweb mould to filling into a double tub incubator / fruiting chamber water reservoir where I have a fish tank heater set to 23C. We used to sell bottles of it on here, but they just weren't getting the sales - bonkers considering how useful it is. If you don't like the idea of putting excess water into the tent, we recommend cutting a corner at least so you can regualrly pour water in and drain it. If you want to know how much humidity gets lost from your grow kit, consider weighing it each day and comparing with the last.

Advice

  • This grow kit is tailored for large flush sizes.
  • You don't need a SAB for this kit, but we still recommend using one for the inoculation stage.
  • Typically 5-8 weeks from start to finish. Can't give exact times because it depends on species, whether live liquid culture or not, temps, genetics, mother nature.
  • Colonisation temp of 23C (give or take a couple of degrees) for many popular species.
  • Fruting temp of around 21C (give or take) for many popular species.

Warning

If you live in a cold home, you need to build or buy an incubator. Don't use heatmats for the love of all things mushroom, we've seen countless people ruin this grow kit because they ignored us (then they go around sharing pictures as if it's the fault of the kit or even us) and it's extremely frustrating tbh. We put a lot of effort into our products, this is the premium you are paying for Cylocybe products and to waste it by not reading our guides isn't just a waste of your money, but it's a slap in the face to the time and effort that we put into our products. You wouldn't heat yourself up by standing on a hot frying pan. Don't listen to the other shops who sell kits like this, we are the OG with this injectable kit... Our guide will keep you right.

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