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.
Step 03 • choose substrate
Our refined CVA recipe, sterilised and bagged with a filter patch. 1, 2 or 5kg.
We offer premium CVA substrate made using only carefully selected, high-quality ingredients. Our recipe has been refined and perfected over the years to deliver a substrate we believe stands among the best on the market.
With a proven track record of consistent performance and impressive results, you can rely on our CVA substrate to provide the quality and reliability your grows deserve.
Pairs withSterilised Grain
CVA is our coco coir based bulk substrate: coir for structure and water-holding, vermiculite for air and moisture buffering, and added minerals, mixed to field capacity and sterilised in a filter-patch bag. It is the recipe we have refined over years of our own grows, and the one we reach for with oyster mushrooms and every other species that likes a compost-style base. Open it, mix your grain spawn through, pack a tub or seal the bag, and it is white in one to two weeks with a vigorous oyster culture.
Sizes and prices: 1kg for $30, 2kg for $50 and 5kg for $100. Prices in AUD, GST inclusive where it applies, shipped tracked Australia-wide.
In a clean space, open the bag, break up your colonised grain and mix it through evenly at 1:2 to 1:4 grain to substrate by weight. The grow builder does the maths.
Flatten the mix in a tub with a lid, or seal the bag, and keep it at room temperature in the dark until the surface is fully white: 7 to 14 days for oysters.
Open to fresh air, add indirect light and keep humidity at 85 to 95%. Pins form in a few days and are ready to pick about a week later.
Oyster mushrooms (blue, pink, pearl, phoenix) all fruit well on coir-based substrate. King oyster, lion's mane, shiitake and reishi are wood lovers and do noticeably better on the wood lovers substrate. If you are not sure, the substrate guide has the species table.
Questions
Yes. Every bag goes through a full autoclave cycle and is sealed with a 0.2 micron filter patch, so it arrives ready to spawn. No oven, no bucket, no pasteurising.
1:2 to 1:4 by weight. A 2kg bag takes 1kg of spawn at 1:2 or 500g at 1:4. Higher spawn rates colonise faster and leave less room for contaminants.
Yes. After colonising, cut the bag open or cut a window in the side and fruit it like a block. A tub gives you a flat, even surface and a bigger first flush.
They will grow on it, but they fruit far better on hardwood. Buy the wood lovers substrate for those.
A few weeks, sealed, cool and out of the sun. Spawn an opened bag the same day.
Guides for this product
All guidesSubstrates 3 min read
Coir is the substrate that made home growing easy: clean, cheap, forgiving and endlessly thirsty. Here is what our CVA blend adds and how to use a bag of it.
Grain & 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.
Species guides 3 min read
The fastest, most forgiving mushrooms you can grow, in four colours for four climates. The only rule they enforce is fresh air.
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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