Substrate Recipes

Growing at home? Here are the recipes that we use…

MMSH: Masters’ Mix 

A substrate blend pioneered by TR Davis of Earth Angel Mushrooms.  This is best for all fast growing strains such as Osyter mushrooms.

This makes 1 Unicorn XLS fruiting bag (4kg is recommended for each).

Total /kg




soy hull pellets /kg




hardwood fuel logs /kg




water /ml




WB25: 25% Wheat bran with 75% hardwood sawdust

This is best for Shiitake but also good for King Oyster, Wine Cap, Chicken of the woods, Turkey Tail, Lions Mane, Maitake and Reishi . Other fast growing species such as Oysters will also grow fine on this if you struggle to source soy hulls.

This makes 1 Unicorn XLS fruiting bag (4kg reccomended)

wheat bran0.50.40.35
hardwood fuel pellets1.51.21.05
water (60%32.42.1

Links to media recipes and sources

Freshcap use 20 cups hardwood pellets, 22.5 cups water and 5 cups wheat bran. Growing Mushrooms on Sawdust Blocks – FreshCap Mushrooms

20% wheat bran from Stamets in ‘Growing gourmet mushrooms’ says 6,400g sawdust, 3,200g woodchips, 800g wheat bran (20%), 100g gypsum, 17,000ml Water (62%).

Grocycle suggest 60% hardwood sawdust (6000g), 20% wood chips (2000g), 18% bran (1800g) and 2% gypsum (200g). 63% Water is 14,000 ml.  GroCycle – Grow Mushrooms The Easy Way

Paul Stamets Sawdust Recipe: 73 % Hardwood Sawdust (7300g), 24.6 % Bran (2460g), 2.4 % Gypsum (240g). 63% Water is 14,000 ml. 

Shiitaki produces best quality fruits with hardwood sawdust and 40% (w/w) wheat bran: Effects of different levels of wheat bran, rice bran and maize powder supplementation with saw dust on the production of shiitake mushroom (Lentinus edodes (Berk.) Singer) – ScienceDirect

MRCA uses 15% wheat bran:

total /kg5kg4kg3.5kg2.5kg
wood chips (30%)0.60.480.420.3
saw dust large (56%)1.120.8960.7840.56
gypsum (3%)0.060.0480.0420.03
rye/wheat bran (15%)
water3L2.4L2.1L1.5L – Straw and pasteurization

Straw of many small grains is a suitable substrate for Oysters. The straw is chopped into 1 to 4 inch lengths and pasteurized by submerging for 1 to 2 hours in water maintained at 160 F. After the straw is drained well, it should contain about 65% moisture. Pasteurization is treatment of a substrate, usually by heat, that eliminates certain microorganisms. We typically soak straw for 4 hours, drain overnight on hardware cloth, and autoclave for 1 hour (the straw is then sterile, and must be handled as such – it may be more susceptible to weed molds if they are introduced since there will exist, by definition, a biological vacuum). 

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