AMK Store Est. 2026
Sterilised grain and premium CVA substrate for gourmet and medicinal mushroom growers. All-in-one grow bags, pre-poured agar, cultures and grow kits are on the way.
The staples
STEP 01• CHOOSE WHAT CULTURE YOU WANT TO GROW
The range
Build your grow
Tell us how much substrate you are filling and the spawn ratio you like. We will work out the grain, pick the cheapest mix of bag sizes, and bag the lot in one click.
Bag mix is the cheapest combination of our bag sizes that covers what you need.
Grain guide
Four grains, one standard. Here is how they compare, in grower terms.
How it fits together
Introduce your culture to a bag of sterilised grain through the injection port.
Sterilised grainLet the mycelium run through every kernel until the bag turns white.
Agar for clean startsBreak up the colonised grain and mix it through your substrate.
Premium CVA substrateGive it fresh air, humidity and light, then harvest your flush.
All-in-ones do 01 to 03 in one bagThe culture library Coming soon
The library is being catalogued now. Join the drop list and you will hear the moment it opens.
The kingdom standard
Grain and substrate both arrive sterilised and sealed, ready to use.
Our CVA recipe has been refined over years of growing for consistent results.
Prepared with proven methods and carefully selected nutrients for a strong start.
Grain bags carry an injection port. Substrate bags breathe through a filter patch.
Questions
Something not covered here? Ask us and we will add it.
Grain is what you inoculate first. Once the mycelium has colonised it, that grain becomes spawn, and you mix it through the substrate: the bulk material your mushrooms fruit from.
Wheat is the all-rounder. Oats and milo break apart easily, and milo gives you the most inoculation points per kilo. Corn has the biggest kernels. The grain guide compares all four.
It depends on your spawn ratio. At 1:2 you use one part grain to two parts substrate, so 5kg of substrate takes 2.5kg of grain. The grow builder does the maths and picks the bag sizes.
Sterilised grain and substrate layered in one bag with an injection port. You inoculate the grain, let it colonise, then mix it through the substrate without opening the bag. They are coming soon.
Keep them sealed, somewhere cool, clean and out of direct sunlight, and use them soon after they arrive.
They are being prepared now. Join the drop list and you will hear first.
Sterilised grain, premium substrate and everything coming next.
Colonised Grain Spawn
Inoculated grain, fully colonised ready for use.
Sold out right now. Join the drop list below to hear when it is back.
Accelerate your grow with our premium colonised grain spawn, carefully prepared and fully established so it’s ready to use straight away.
Designed to give you a reliable head start, our high-quality grain spawn can be transferred directly to bulk substrate or used to expand into additional sterilised grain.
Healthy, vigorous and ready to go, it’s the perfect choice for growers looking to save time while achieving strong, consistent results.
Pairs withWood Lovers Substrate
Colonised grain spawn is our sterilised grain, inoculated with a vigorous culture and run right through until every kernel is white. Pick reishi, pink oyster, blue oyster, lions mane, king oyster and shiitake. Open it in a clean space, break it up, mix it through a substrate and you are straight into the bulk phase. It is the fastest route to a first flush and the surest, because the part of a grow where most beginners pick up a contaminant has already been done in our lab.
Sizes and prices: 1kg for $60 and 2kg for $110. Culture: Reishi, Pink Oyster, Blue Oyster, Lions Mane, King Oyster and Shiitake. Prices in AUD, GST inclusive where it applies, shipped tracked Australia-wide.
Oysters: our CVA or CVWA coir blends, or hardwood. Lion's mane, shiitake, king oyster, reishi: the wood lovers substrate.
Break the bag up from the outside first. In a still air box or in front of a flow hood, open both bags and mix the spawn through evenly: 1:2 to 1:4 for coir tubs, 1:4 to 1:5 for hardwood blocks.
Dark, room temperature, until the substrate is white; then humidity, fresh air and light. The species guides have the numbers.
A handful of colonised grain dropped into a fresh sterilised grain bag turns one bag of spawn into five or more. Grain-to-grain transfers need clean technique, but they are the cheapest way to run a whole season from one purchase. The colonised spawn guide shows how.
Questions
2kg at 1:2, 4kg at 1:4 for coir blends; 4 to 5kg for hardwood blocks at 1:4 to 1:5.
Best within a week of arrival. Refrigerated, two to three weeks with slowly falling vigour. Let it warm up before use.
Yes, by grain-to-grain transfer into sterilised grain bags in a still air box. One bag becomes five to ten.
Each species takes weeks to colonise and is grown in batches. Leave your email on this page to hear when the next batch is ready.
Guides for this product
All guidesGrain & spawn 3 min read
More spawn is faster and safer, less spawn is cheaper. Here is where the sweet spot sits for coir tubs and hardwood blocks, and a calculator that does the sums.
Substrates 3 min read
Substrate is dinner. Oysters will eat almost anything; lion's mane and shiitake want wood. Match the menu to the species and most problems never happen.
A few details, then you pay on a secure page.
The drop list
Restocks, new cultures and first dibs on grow kits. One email when something lands, nothing more.
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