Master's Mix Substrate 3×3.6 kg sterile

3×3.6 kg Master's Mix mushroom substrate – sterile autoclaved, hardwood, wheat bran & gypsum • Set of 3 • Autoclaved • Made fresh to order • Ready to inoculate

What is Master's Mix – and why is it so popular?

Master's Mix is a proven substrate blend of hardwood sawdust, wheat bran and gypsum. This combination has established itself worldwide as a premium substrate for growing gourmet mushrooms. The reason: the bran supplies nutrients for fast, vigorous mycelium growth, while the sawdust provides a stable structure and keeps moisture even. The result is higher yields and firmer fruiting bodies compared with low-nutrient substrates such as plain straw or CVG.

Why sterilised and not just pasteurised?

Master's Mix contains wheat bran – a nutrient-rich additive that attracts not only mushroom mycelium but also contaminants such as Trichoderma, bacteria and mould. Pasteurisation is not enough for nutrient-rich substrates. That's why we sterilise every batch in the autoclave under controlled conditions: this eliminates all foreign organisms and gives your mycelium a clean head start. The sterile bag with filter patch keeps it that way until you use it.

Every ingredient has its job

Hardwood sawdust

Gives the mycelium a stable structure that is easy to colonise and keeps moisture even throughout the block. Hardwood is preferred by most gourmet mushroom species.

Wheat bran

Supplies nitrogen, proteins and carbohydrates – the nutrients the mycelium needs for fast growth and a high yield of fruiting bodies.

3 bags – for different species or a bigger harvest

With the set of 3 you get three independent, sterile-packed substrate blocks of 3.6 kg each. Ideal for trying out different mushroom species at the same time, increasing your success rate or simply harvesting more. Each bag is sealed individually and can be inoculated independently.

Easy to use with grain spawn

Open the bag under conditions as clean as possible, mix in your fully colonised grain spawn evenly or layer it on top, and close the bag. At a suitable temperature (20–25 °C depending on the species), let the mycelium colonise the block. Once the block is fully colonised, cut the bag open and start fruiting conditions.

Especially suitable for wood-loving edible mushrooms

Master's Mix is the first choice for wood-loving species, including: oyster mushrooms, shiitake, lion's mane (Hericium erinaceus), king oysters, pioppino and maitake. It is also suitable for growing reishi (Ganoderma) as a living wood culture – reishi is not eaten as an edible mushroom, though, but kept as a decorative and living culture.

What's included:

3 × 3.6 kg Master's Mix substrate blocks, autoclaved, sterile sealed with filter patch.

Produced fresh to order. Keeps for up to 4 weeks in the fridge.

Who's behind it?

Meisterpilze was founded by an immunobiologist with a doctorate and a chemist – a kitchen experiment turned into urban mushroom production. We grow gourmet mushrooms for restaurants and markets, with scientific precision in every batch. Lab coat meets mushroom farm.