Popcorn Grain Bags at Fungi Myco

Popcorn Grain

for colonisation

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Key Features

  • Sterilised at 15 PSI for 3 hours to kill competing microorganisms and bacteria.
  • Includes self-healing port for inoculation via syringe.
  • Complete with filter for fresh air exchange (FAE)

What's in the Box

  • A Unicorn Bag of Popcorn Grain complete with self-healing injection port and filter (depending on your selected size)
  • Online step-by-step instructions

Overview

Our Drippy Corn, sterilised popcorn grain spawn, is a reliable, fast-colonising option made from high-quality whole kernel popcorn, fully hydrated and sterilised for ease of use. If your liquid culture has been pre-conditioned with either fructose or glucose, you'll notice a shorter lag phase as the mycelium adjusts, acclimatises, and begins colonisation.

What makes popcorn stand out is its larger kernel size and naturally airy structure. This gives the mycelium more room to breathe, spread, and colonise rapidly. It also breaks up easily when shaken, making it ideal for grain-to-grain transfers and promoting even faster expansion across your substrate.

Corn is naturally rich in starches and amino acids, providing the energy and nutrients mycelium needs to thrive.

 

Our Expert's Opinion

Tony, our resident mycologist, has this to say.

Pros

  • Beginner Friendly - Larger kernel size makes it easier to shake and break up after colonisation
  • Fast Colonisation - Although larger in size making for less inoculation points, once permeated the mycelium colonises kernals quickly.
  • Less Clumping - When properly dried, popcorn shows less signs of clumping, which is helpful for G2G transfers or LC inoculation.

Cons

  • Slower Colonisation of Bulk Substrate - Popcorn's kernals are bigger in comparison to smaller grains like millet (due to fewer inoculation points per volume) which may affect colonisation time of substrates.

Tips

  • Reduce Contamination Risks — Shake the bag gently before use to redistribute moisture and prevent wet pockets, which can promote bacterial contamination. Let the bag fully colonise before handling and only open it in a sterile environment, like a still air box or in front of a laminar flow hood.
  • Kickstart Colonisation - If your bag stops colonising and stalls, it’s usually because of positive pressure on the mycelium. Turn the bag on it’s side to change the pressure point and allow your mycelium the room it needs to spread.

Select the right bag size

Something that other suppliers might not tell you is that if you are looking to inoculate your spores or liquid culture then a big bag would be a big mistake. The surface area is larger. Colonisation takes longer. You'll likely lose the batch. Start small for inoculation!

For other purposes such as grain-to-grain transfers or bulk grows - bigger bags make more sense.

Save yourself time & money — get the right bag for the job!

Grain Size: 750gGrain Size: 1kgGrain Size: 1.5kg

Inoculation

G2G Transfers

Bulk Grows

Inoculating your Grain

Using sterile practice, inject your mushroom spore syringe through the self-healing port and let the magical mycelium do its thing. Once fully colonised, mix the grain with your bulk substrate

Of course, this all assumes you actually want to grow mushrooms. You could also fill a balloon with grain and make an eco-friendly stress ball, half-fill a container and make homemade maracas, or hell, feed it to the birds.

But whatever you do, for the love of God – do not use your Popcorn Grain to be growing magic mushrooms!!

Watch a short video on how to inoculate grain with a spore syringe.

Best for Storage

  • For best results use immediately
  • If not using right away — store somewhere cool and dark, ideally 10–21°C, away from direct sunlight and heat sources. Refrigeration (2–8°C) is fine and can help extend freshness; as long as the bag stays sealed and dry
  • Keep in the original sealed bag until you're ready to use — this keeps the item sterile and protected from pests
  • Do NOT freeze
  • Correctly stored, this item will last around 8 weeks

Payment

We currently only accept bank transfer — full details are provided upon checkout.

Why don't we accept card payments? Unfortunately despite progress, the industry is still heavily stigmatised (from banks) which means that even payment gateways such as PayPal don't provide a service for any spore provider based in the UK (also the reason that you cannot buy these spores on the high street).

We encourage you to read our customer reviews to see the experiences others have had with us.

Still got questions? — reach out to us.

Delivery

In the UK, please allow 2-3 days delivery time from dispatch. Outside the UK times can vary greatly - so it is better to order well in advance.

We currently deliver to the following countries: Austria, Belgium, Czechia, France, Greece, Italy, Netherlands, Spain, U.S.

See our full delivery policy

Returns

Unopened items or otherwise damaged or defective products can be returned within 30 days.

Please contact us straight-away and we'll be sure to put things right.

See our returns policy