Colonised Grain Spawn
Colonised Grain Spawn
Inoculated grain, fully colonised ready for use.
From$60
Sold out
AMK Store Est. 2026
Sub & grain fit for a kingdom.
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.
- Sterilised
- Injection-port grain bags
- Filter-patch sub bags
The staples
EVERY GROW STARTS WITH THESES STEPS
STEP 01• CHOOSE WHAT CULTURE YOU WANT TO GROW
The range
Everything for the grow.
Build your grow
How much grain do you actually need?
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.
Substrate
Grow docketAMK Store
2.5kg grain
+
5kg substrate
Total$0
Bag mix is the cheapest combination of our bag sizes that covers what you need.
Grain guide
Pick your grain.
Four grains, one standard. Here is how they compare, in grower terms.
How it fits together
Plate to harvest in four moves.
-
01
Inoculate
Introduce your culture to a bag of sterilised grain through the injection port.
Sterilised grain -
02
Colonise
Let the mycelium run through every kernel until the bag turns white.
Agar for clean starts -
03
Spawn to sub
Break up the colonised grain and mix it through your substrate.
Premium CVA substrate -
04
Fruit
Give it fresh air, humidity and light, then harvest your flush.
All-in-ones do 01 to 03 in one bag
The culture library Coming soon
Gourmet & medicinal, on the bench.
The library is being catalogued now. Join the drop list and you will hear the moment it opens.
The kingdom standard
Made properly, bagged properly.
Sterilised
Grain and substrate both arrive sterilised and sealed, ready to use.
A refined recipe
Our CVA recipe has been refined over years of growing for consistent results.
Nutrient-enhanced grain
Prepared with proven methods and carefully selected nutrients for a strong start.
Proper bags
Grain bags carry an injection port. Substrate bags breathe through a filter patch.
Questions
Good to know.
Something not covered here? Ask us and we will add it.
What is the difference between grain and substrate?
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.
Which grain should I choose?
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.
How much grain do I need for my substrate?
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.
What is an all-in-one grow bag?
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.
How should I store my bags?
Keep them sealed, somewhere cool, clean and out of direct sunlight, and use them soon after they arrive.
When do cultures, agar and grow kits land?
They are being prepared now. Join the drop list and you will hear first.
Colonised Grain Spawn
Grain spawn, already colonised and ready to use
Colonised grain spawn is sterilised grain that we have inoculated and run right through with the species you choose, so the two or three weeks of colonising are already done. Open the bag in a clean space, break it up, mix it through a substrate at 1:2 to 1:4 and you are straight into the bulk phase. It is the fastest route to a first flush and the easiest way to skip the step where most first grows go wrong.
Species: Reishi, Pink Oyster, Blue Oyster, Lions Mane, King Oyster and Shiitake. Colonised Grain Spawn from $60 (1kg, 2kg). Orders ship Australia-wide, tracked, from $15. See delivery.
Two ways to use it
- Straight to bulk. Mix the spawn through substrate, pack a tub or bag, and let it colonise. A 1kg bag of spawn at 1:2 covers 2kg of substrate; at 1:4 it covers 4kg.
- Grain to grain. Drop a handful of colonised grain into a fresh sterilised grain bag in a still air box and one bag becomes several. This is how you stretch one purchase across a season.
Match the spawn to the substrate
Oysters are happy on our coir-based CVA and CVWA blends or on hardwood. Lion's mane, shiitake, king oyster and reishi want the wood lovers substrate. The substrate guide has the full table.
Questions
Good to know
What is colonised grain spawn?
Sterilised grain that has been inoculated with a mushroom culture and fully colonised by its mycelium, so it is ready to mix into substrate or to expand into more grain. You skip the inoculation and the wait.
How much colonised spawn do I need?
At 1:2 grain to substrate by weight, 1kg of spawn covers 2kg of substrate; at 1:4 it covers 4kg. Faster, safer colonisation comes from the higher ratio.
How long does colonised grain spawn last?
It is at its best used within a week of arrival. In the fridge it holds for two to three weeks, though vigour slowly drops. Let it come to room temperature before you use it.
Why is it sold out?
Spawn is grown to order in batches and each species takes weeks to colonise, so it sells through quickly. Leave your email on the product page to hear when the next batch is ready.
Can I expand colonised grain spawn?
Yes. Grain-to-grain transfer in a still air box turns one bag into five to ten fresh sterilised bags. Work clean and use the spawn while it is young and vigorous.
Read before you buy
All guidesGrain & spawn 3 min read
Grain spawn to substrate ratio: how much spawn you actually need
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
Mushroom substrate guide: coir, hardwood and the right one for every species
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.
Checkout
A few details, then you pay on a secure page.
The drop list
Join the kingdom.
Restocks, new cultures and first dibs on grow kits. One email when something lands, nothing more.