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Rye Grain (Hydrated & Sterilised)

4.67 out of 5
(6 customer reviews)

£12£13.75 (incl. VAT)

Sterilised and perfectly hydrated rye grain for spawn production and bulk mushroom grows. 100% organic. Sold in genuine Unicorn Bags double sealed with integrated autoclave sterilisation indicator.

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% Sterility Guarantee for 30 days so you can rest assured you’re getting the best, or your money back.

Unicorn Filtered bags: 0.75kg, 1.2kg & 1.5kg. All with injection ports.


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 (though risk of contamination is higher with spore syringe). Ready for inoculation.
  • Guaranteed sterile or your money back
  • Suitable for beginners and advanced growers
  • Thoroughly washed before soaking
  • Made from certified UK grown organic grain
  • Soaked in a weak spent coffee grounds 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
  • Made fresh to order 3 times a week

Made fresh to order, please allow up to one week for delivery. FAQ’s below.

Free Delivery Option for all orders over £60

Discreet Shipping as Standard

Backed by our 100% Satisfaction Guarantee

£12£13.75 (incl. VAT)

Purchase today to earn 12-13 POINTS worth £0.60-£0.65 to redeem on your next order.
Purchase today to earn 12-13 POINTS worth £0.60-£0.65 to redeem on your next order.

Frequently Bought Together


What are the little black bits in the rye grain?

We add a small amount of spent coffee grounds to our rye grain soak water to increase nutrient diversity. Mushrooms love coffee grounds!

The grain looks dry and powdery, is it OK?

That’s the gypsum. We add 8% gypsum to our soak water before boiling. It add’s essential minerals to the rye grains and can be used as a supplmement at almost all stages of mushroom production. It’s got the added benefit of stopping the grains from sticking together in the bag, allowing for a faster and more healthy colonisation with less chance of contamination.

Additional information

Weight N/A

6 reviews for Rye Grain (Hydrated & Sterilised)

  1. 5 out of 5


    Waited a week after they arrived and still contaminate free looking forward to get growing

  2. 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!

  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

  4. 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.

  5. 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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