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M-Minus Manure-free Substrate (5 lb)

Grow Mushrooms in Monotubs


  • Vegan fruiting substrate without manure
  • Designed for manure-loving mushrooms
  • Sterile and perfectly hydrated when opened
  • 12-month shelf life guaranteed
  • Consistent results with high yields


Grow manure-loving mushrooms in monotubs and bags using our sterilized blend of high-yielding fruiting substrate. Designed for beginners to commercial mushroom growers. Take control of your cultivating skills using our line of extended shelf life substrates.

Wanting to scale up? Contact Us.

Product Details

This premium coco coir based substrate is the perfect blend for monotub mushrooms growing. Designed for beginners to commercial growers. It can be stored for up to 12 months in its current packaging at room temperature prior to use, offering flexibility for your mushroom cultivation projects. It contains the optimal moisture level for high yields and multiple harvests. Enhance your cultivation skills with consistent results when you use M-minus.

Pro Tip: UseΒ M- blends as a casing layer when creating bins of king oysters for yield-enhanced flushes.

Disclaimer: Myterra Labs does not condone the use of its substrate to grow any species of mushroom that contains psilocybin unless they are legal in your jurisdiction. Please note that our products shall be used only for lawful purposes.

New to growing mushrooms?

There are A LOT of edible mushrooms you can grow at home, but it really depends on where you’d like to grow them! For the beginner, we recommend oyster mushrooms (indoor and outdoor), Wine Cap (outdoor beds) and shiitake (indoor bags or outdoor logs). All are reliable producers, and will increase the likelihood of a successful first attempt!

Mushrooms grow on grains when the mycelium is establishing itself, and these grains are transferred to a fruiting substrate in order to get mushrooms and multiple harvests. Different mushrooms grow on different fruiting substrates, but they are all able to grow on the same grain. Please see our Mushroom Substrate Compatibility Guide for a better understanding of what your specific species will grow on -> clickΒ here.

Mushrooms can take anywhere from 4 weeks to 10 months to grow from a liquid culture all the way to the first harvest. The timeline varies depending on the type of mushroom, the style of growing, and the environment you grow them in. Oyster mushrooms are the fastest mushroom to grow – with harvests in 4-5 weeks using Myterra Labs Gourmet Mushroom Kit.

Each mushroom will have a different set of environmental conditions that they prefer to grow in. Generally, most mushrooms prefer a humid environment and indirect sunlight or shade. Optimal environmental conditions are specified with each liquid culture.

Substrate is the material needed to grow mushroom mycelia and acts as a souce of nutrition, energy, structural support and water necessary for the mycelia to produce fruits/mushrooms. Mushrooms needing substrate to grow can be compared to plants needing soil to grow. Please ensure that you are using the correct type of substrate for the species of mushroom that you want to grow.

Using sterilized substrates is crucial for growing mushrooms because it eliminates competing organisms and contaminants, providing a clean environment for the mushrooms to thrive. This ensures healthier and more successful mushroom cultivation, minimizing the risk of contamination and maximizing yields.

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