Grower’s Select Complete Monotub Kit: Hard Case
Everything you need for a bulk mushroom grow, in one box, in three sizes

You don’t need to shop around for each part. We’ve paired our Grower’s Select hard monotub with Millet All in One spawn, substrate, a sterilised casing layer, an atomiser and the essentials for a bulk grow. Just choose your size from the dropdown, and the kit arrives ready to go.

You will also need:

• Gloves
• A spore syringe or liquid culture syringe

What’s Included

• 1 × Grower’s Select hard monotub (Small 25L, Medium 40L or Large 60L), moulded from super-dense polypropylene, with a custom pre-cut liner and adhesive filter disks (4 × with the Small, 6 × 6.5cm with the Medium and Large)
• Sterile Coco Coir All in One (Millet) spawn bag(s) with self-healing injection port and air filter
• CVG bulk substrate to suit your tub. It lasts 6 weeks before use and still holds enough moisture.
• Sterilised mushroom casing layer
• Heavy-duty atomiser fine mister, 300ml
• Isopropyl 70%, 100ml bottle
• Digital video instructions: scan the QR code on the card in your package

Choose Your Size

• Small Monotub (25L): Compact and space-saving. Great for beginners, strain testing and limited space, and up to 10 tubs can be stacked safely. Comes with 1kg spawn, 2kg bulk substrate and 1kg casing layer.
• Medium Monotub (40L): Our favourite for a good yield in a hard, durable tub, and the ideal step up from jars. Comes with 1.5kg spawn, 3kg bulk substrate and 2kg casing layer.
• Large Monotub (60L): For experienced growers chasing a mega harvest. Comes with 2kg spawn, 4kg bulk substrate and 2kg casing layer.

Why Casing?
Casing is the set-and-forget method: once the casing layer is on, you rarely need to open the tub to mist, so the chance of contamination drops a lot. All casing we supply is sterilised. The atomiser is there if the surface ever needs a fine mist, and for rehydrating between flushes.

Why a Hard Monotub?
The reinforced, stackable tub holds humidity steady and lets in filtered fresh air. That supports a dense canopy and dependable flushes without complicated equipment. The filter disks allow gas exchange, which triggers pinning while keeping contaminants out. The pre-cut liner makes cleanup easy and reduces side pinning. The tub is reusable grow after grow, and running at least 2 tubs at a time spreads the risk.

How to Use

1. Inoculate: Wipe the injection port with isopropyl, then inject your spore or liquid culture syringe into the spawn bag. Wait until the bag is fully white.
2. Prepare: Spray the tub and liner with isopropyl and fit the liner. Add the substrate and colonised spawn in layers, finishing with substrate on top. Don’t add the casing yet.
3. Colonise: Cover the filter disks with packing tape. Over the next couple of weeks, the substrate will turn white.
4. Check your tub:
   • Evenly white with no discolouration: All good, so move on to the next step.
   • Green, blue-green or black patches: The tub is contaminated and can’t be saved. Don’t open it indoors. Take it outside, open it there and discard the contents in your garden. Then reset: wash the tub with hot soapy water, dry it, spray with HOCl, wipe after 10–20 minutes, then spray with isopropyl (no need to wipe). Fit a fresh liner and start again.
   • Some moulds, like Trichoderma, start white and only turn green later, so keep checking.
5. Case: Once the tub is fully white, spread the sterilised casing evenly over the top.
6. Fruit: Remove the tape to expose the filters. This fresh air exchange starts pinning. If the surface looks dry, mist lightly with the atomiser to keep very fine droplets on it, and stop once pins form.
7. Harvest and second flush: Harvest before the caps flatten. Afterwards, mist heavily with about 150ml of water. It soaks in overnight, and the next flush follows in 7–10 days. When you’re done, lift out the liner for an easy cleanup.

Which Mushrooms Can I Grow?
Swordbelt is our top pick (it grows in winter), and any oyster mushroom works well.

Can I grow Shiitake?
Not with this kit. Shiitake needs a wood substrate and more airflow.

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