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Grain (Hydrated & Steralised)

4.50 out of 5
(4 customer reviews)


Steralised and perfectly hydrated grain for spawn production and bulk mushroom grows. 100% organic. Numerous grains available and sold in premium mushroom spawn bags, with or without an injection port.

Hand-Made with ❤ in Bristol, UK.

We’ve heard countless stories of people buying spawn and hydrated grains from home-producers, only to receive under or over hydrated grains, or worse, contaminated bags.

We are masters in spawn production, with multiple spawn production runs each week. We offer our 100% Grow Guarantee so you can rest assured you’re getting the best, or your money back.

We Also Offer
Grow at Home Mushroom Kits | Mushroom Fruiting Blocks | Liquid Cultures & Spore Syringes

  • Perfectly hydrated with filtered rain water to a consistent moisture content of 55%
  • Can be used with liquid cultures or any number of our spore syringes. Ready for inoculation.
  • Guaranteed sterile or your money back
  • Suitable for beginners and advanced growers
  • Thoroughly washed before soaking
  • Multiple grains available
  • Made from certified UK grown organic grain
  • Soaked in a weak coffee solution for added nutrients
  • Added horticultural gypsum at 8% to help keep grains separated and to add essential minerals and trace elements to support vigorous mycelial growth
  • Prepared in the same way we make our commercial spawn bags
  • Suitable for all mushrooms cultures
  • Available with or without self-healing injection port
  • Made fresh to order 3 times a week

Note that hydrated grains are used to grow mushroom spawn these are not grow at home mushroom kits.

Each bag or jar will contain a minimum of 1 lb (454 grams).


Free delivery on all orders over £150

Backed by our 100% Satisfaction Guarantee.



Frequently Bought Together

BUILD YOUR OWN GEAR! - View our kit lists @ kit.co

Fruiting Room Lab Substrate/Spawn Preparation
Must Have Books Order Preparation
  • Packaging & Scales
  • Mushroom Dehydrator Build

Tincture Production

Vlogging Equipment & Digital Production


4 reviews for Grain (Hydrated & Steralised)

  1. 5 out of 5


    grain preparation can be a bit of ball-ache when you're trying to make a lot with a relatively small sized autoclave. This is the first time I've bought this in bulk, but for the price, it's not really worth me making it myself any more. That's capitalism for you (or maybe just scales of economy). Either way, I'm happy. Grains were perfectly hydrated, no standing water and mycelium is growing as expected. Mushroom cultivation has just got even easier…

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  2. 5 out of 5

    Jodie S.

    Perfect for the lazy mushroom head!

    On a more serious note, grains came well packaged and perfectly hydrated.

    I initially thought the grains were dry, so I contacted their support team who clarified that they weren't dry, but that they had been soaked and boiled in water containing gypsum, and when they are allowed to steam dry, there can be a fine residue white powder on the outside of the grain which can make it look dry. Paul from support said that I should try them, and if I wasn't happy he'd either send me a batch with no gypsum added or a refund! Needless to say, the grains were perfect, and I learnt something! Thanks for your support Paul. Have a nice rest of the day.

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  3. 3 out of 5


    Correctly hydrated and good quality but I think it's a little bit expensive for hydrated grain. Maybe if you're ordering in bulk or buying other supplies it makes sense but I just needed some grain as my pressure cooker packed in last week

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  4. 5 out of 5


    I don't really ever buy pre-hydrated and sterilised grain as grow on quite a small scale but I wanted to conduct side-by-side grow trials of various grains and measure colonisation times and resulting yields of each. Seemed like a no brainer. Haven't found any other company offering this, so thumbs up to you for doing so! I'm sure there are others out there who appreciate it as much as me. Leep up the good work!

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Additional information

Grain Type

Rye, Millet, WBS (Wild Bird Seed)


Jar, Bag

Injection Port

Yes, No

No. of Bags/Jars

1, 6, 12

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Free Mushroom Selection Box

A selection of our finest organic dried mushrooms

No catches, we'll send one to you a dried gourmet mushroom selection box for free, we'll even pay the postage.
Why are they free? We just want to let you sample our mushrooms, if you like them, (which we're sure you will!), you might want to buy some more from us in the future.