Description
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 spawn, substrate and the essentials for a bulk grow. Choose your size, spawn type, casing and atomiser from the dropdowns, and the kit arrives ready to go.
Prefer to buy items individually? See everything you need to Grow in a Monotub.
You will also need:
Gloves
A spore syringe or liquid culture syringe
What’s Included
1 × Grower’s Select hard monotub (Small, Medium or Large), 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 spawn bag(s) with self-healing injection port and air filter. Your options are Rye, Millet, Sorghum (Milo), Coco Coir All in One (Millet), Coco Coir All in One (Rye) and Manure All in One.
Bulk substrate to suit your tub. Grain and Coco All in One options come with CVG substrate, and Manure All in One comes with manure substrate. We’re happy to take swap requests. The substrate lasts 6 weeks before use and still holds enough moisture.
Isopropyl 70%, 100ml bottle
Digital video instructions: scan the QR code on the card in your package
Optional: sterilised mushroom casing layer
Optional: heavy-duty atomiser fine mister, 300ml
Choose Your Size
Small (25L) / Dimensions L x W x H (30.5 x 30.5 x 30.5 cm) : 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 an optional 1kg casing layer.
Medium (40L) / Dimensions L x W x H (45.7 × 39.4 × 30.5 cm) : Our favourite for a good yield in a hard, durable tub, and the ideal step up from jars. Comes with 2kg spawn, 3kg bulk substrate and an optional 2kg casing layer.
Large (60L) / Dimensions L x W x H (57.2 × 39.4 × 30.5 cm) : For experienced growers chasing a mega harvest. Comes with 2kg spawn, 4kg bulk substrate and an optional 2kg casing layer.
Casing or No Casing?
We recommend casing. It’s 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. Without casing, you’ll need to keep the surface misted, which is what the atomiser is for. All casing we supply is sterilised.
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
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.
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.
Colonise: Cover the filter disks with packing tape. Over the next couple of weeks, the substrate will turn white.
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.
Casing (optional, recommended): Once the tub is fully white, spread the sterilised casing evenly over the top.
Fruit: Remove the tape to expose the filters. This fresh air exchange starts pinning. If you didn’t use casing, mist with the atomiser to keep very fine droplets on the surface, and stop once pins form.
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. Portobello and Almond mushrooms are possible but untested, and they’re for advanced growers only. For those, choose Manure All in One and request pasteurised casing in your checkout note, or they won’t fruit.
Can I grow Shiitake?
Not with this kit. Shiitake needs a wood substrate and more airflow. Try our Max Yield Monotub kit | Grains & Substrate with the sawdust option.
Grow After Grow
Replacement filters, plugs and liners are available from our Mushroom Monotub Fruiting Chamber: Hard Case listing. Search for that listing rather than “liners”, because all the options are combined there.
Looking for more? Browse our Monotubs range, including the Boomer Shroomer Inflatable Kit and Max Yield range, or our Mycology Tools.
