All-in-One Mushroom Grow Kit

£16.50 inc. VAT

Our freshly produced, made-to-order All-in-One mushroom grow kits are the easiest way to grow many strains of mushrooms. With sterile grain and substrate in the same bag, you reduce steps and chances of contamination from setting in.

In our bags, you’ll find approximately 750g of hydrated organic rye grain mixed with the same amount of CVG substrate (Coir, Vermiculite & Gypsum). It is then hydrated to field capacity and sterilised in our industrial steam autoclave for 3.25 hours at 126°C. This provides the perfect 1:1 spawn ratio for quick colonisation times, big yields and low risk of contamination.

Simply inject grain with your liquid culture or chosen inoculant (to be purchased separately), wait for the grain to colonise, mix the bag up, wait for total colonisation, and either fruit mushrooms directly from the bag or in your chosen fruiting chamber like a monotub, shotgun fruiting chamber, or ‘martha’ style greenhouse fruiting chamber. Full instructions included.

We are masters in grain, substrate and mushroom spawn production. We have produced and sold over 100,000 mushroom grow kits to date, supplying to both commercial mushroom farms and hobby mushroom cultivators alike.

To ensure you receive only the freshest product, most bags are made to order and subject to the lead times below. However, we hold a limited quantity of stock to fulfil small and urgent orders. We offer a 100% Sterility Guarantee for 30 days for your own peace of mind.

Please familiarise yourself with the FAQ's & drop-down sections below before placing your order.

+ Lead Times

For freshly produced, high-volume or ‘made to order’ items there could be an additional delay in dispatching your order, this is known as a ‘lead-time’ or production time. Our estimated lead times for this product are shown below:

  • Less than 48 units: up to 1 week
  • 120 units: up to 2 weeks
  • 480 units: up to 3 weeks

Please contact us if you require larger orders sooner; we may be able to expedite your order for a small charge.

+ Technical Information
  • Full Instructions Included (link below)
  • Made from certified UK-grown organic grain & low salt content coir
  • Genuine Unicorn Filtered Bag with Injection Port
  • Grain is triple-washed to remove chaff, soaked overnight and boiled to a consistent moisture content of 55%
  • Bags can be used with all liquid cultures or spore syringes (though the risk of contamination is higher when using spore syringes).
  • Suitable for beginners and advanced growers.
  • 8% horticultural gypsum is added to help keep grains separated and to add essential minerals and trace elements to support vigorous mycelial growth.
  • A liquid culture will need to be purchased separately
  • Orders of 12 bags or more will most often be supplied without bag tag numbers or sterilisation indicator strips in order to keep prices low for our bulk customers.
  • Note that we cannot refund or replace already inoculated/used bags; please follow the included instructional guide (link also below) so you can self-validate the bag’s sterility before inoculation and ensure a successful grow.
+ Shipping & Returns


Orders are usually dispatched same or next working day, but please allow up to 3 working days for dispatch + any additional product lead times as sometimes we can get incredibly busy.

We package our products in plain, unbranded, reinforced cardboard boxes with plenty of internal protection.

Our shipping couriers may leave parcels with a neighbour or in a safe place if nobody is home to receive them. To avoid this from happening, please choose the designated signed for service at checkout (and ensure you are in to receive the parcel, else it’ll be held at your local sorting office or returned to us) – We cannot be responsible for lost, stolen or missing parcels where the signed for shipping service have not been selected at checkout.

Items which have have been returned to us due a failed delivery may be subject to a redispatch or re-stocking fee, so please ensure packages any held packages are collected from your local sorting office within 2 weeks to save them being returned.

We strongly advise people upgrade their shipping to ‘DPD Express Tracked‘ service at checkout as we find this to be the quickest, safest and most reliable service. Royal Mail do occasionally have delays in their sorting offices.

For more info, please see our shipping, returns and replacements policy.

+ Quantity Discounts

To allow us to serve all of our customers fairly, we are only able to process a total of 96 sterile grain or substrate bags per customer/week directly through our website.

Quantity Item Price % Discount
1 £16.50 -
2 £15.68 5%
3 £15.51 6%
4 - 5 £14.36 13%
6 - 7 £13.04 21%
8 - 11 £12.71 23%
12 - 23 £12.05 27%
24 - 47 £11.39 31%
48 - 96 £10.89 34%

To allow us to serve all of our customers fairly, we are only able to process a total of 96 made to order products directly through our website per customer/week.

For larger quantities and wholesale enquiries, please contact our sales team so they can give you the best price, lead-times and delivery information.

Our most recent wholesale price list can be found here: Wholesale All-in-one Bags – June 2023

Purchasing Disabled

Due to recent flooding in our warehouse and processing facilities, we're only accepting orders for a limited number of our products, which are available for purchase on our eBay store.

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5-Star Customer Testimonials

Over 2,300 rave reviews and counting! Here's a random selection (different on every page)...

Fast delivery, good product, always had successful fruiting with maya. Going to try lions mane next. Meant to be good for preventing dementia and we have never been able to find them when foraging.

⭐⭐⭐⭐⭐Carly Gilmour on Google

Very happy with the products from this store. Purchased on etsy and had a good experience and will definitely come back again

⭐⭐⭐⭐⭐Isaac Antoine on Google

These guys are great and definitely worth the coin! I don't get grow bags from anywhere else now but have found these have the perfect ratio of contents and have never been contaminated so it is clear its very sterile.

⭐⭐⭐⭐⭐Danny Darka on Google

Best spawn bags on UK market! I've ordered couple of times from Maya and was never disappointed! Quality bags, quality packaging & best customer service! 5/5 👍🏼👍🏼

⭐⭐⭐⭐⭐Kamilo Kamil on Google

Mushroom Growing Kit All-in-One FAQ’s

Answers to frequently asked questions.

Do you accept cash payments for larger orders?

Yes, we accept cash payments, but would require a none-refundable 20% deposit to be paid to add your order to our jobs list. The remaining balance of your order can be paid in cash on collection (we don't accept cash in the post). Once your order is ready, it will need to be collected and paid for in full within 3 weeks, else we reserve the right to re-sell your order and your deposit will not be refunded.

To pay a cash deposit, please process your order online as normal, select whichever payment method you wish, and use the following discount code at checkout to take 80% off the order, leaving a 20% deposit: cash-deposit-20

Note that this discount code is only to be used to leave a 20% deposit for cash collection orders only. Please make contact with us before to discuss lead-times and collection windows.

There is a minimum order value of £500 to pay a cash deposit.

How will my product be packaged and shipped?

We put a lot of time and money to ensure our parcels are sent out so that they reach you safely and undamaged.

If your item will go in a box, it will be sent out in a discreet, plain, sturdy, double-walled cardboard box of appropriate size, with no branding packaging tape and plenty of internal packaging protection to avoid any damage during transit (though sometimes accidents can happen, but it's rare).

Smaller items which are sturdy and light will be sent out in plain, unbranded, padded envelopes.

All pallet orders are professionally strapped and wrapped with corner protectors.

We try to minimise the use of excessive packaging where can, to help save mother nature and all her gloriousness.

Scroll down to see a section on our Shipping & Returns info, with links out to our policies

Can I collect my order from your facility?

For larger orders that would otherwise typically go on a pallet, that's fine, but generally speaking, we'd prefer to ship to an address. Please contact us before placing your order if you want to collect your order to see if we can accommodate it. We are based in the Forest of Dean. We've got a busy warehouse where we do our thing, but we don't (yet) have a shop.

What is included with my All-in-One Kit purchase?

Each order comes with the quantity of bags ordered, one instructional guide and one set of alcohol wipes per order. Please leave a note at checkout if you require additional instructional guides or alcohol wipes. You will need to purchase a liquid culture of your chosen mushroom strain separately.

Where can I download a copy of the Instructional Guide

A copy of our instructional guide can be downloaded here: All-in-One Grow Bags Instructions – Folded Booklets

Note, that a printed hardcopy of the instructional guide will be included with your order.

What else do I need to purchase to grow mushrooms?

There are numerous ways of growing mushrooms, and will depend on your experience, available equipment and time availability. At a minimum, you will need to purchase the following in addition to your grain bag(s):

Liquid Culture – A mushroom liquid culture of the strain you want to grow. (You may also use a spore syringe, but we do not recommend it due to the higher risk of contamination)

Substrate – You will need to decide on the most suitable substrate for the mushrooms you are growing. Substrate is required to mix with colonised grain spawn to ensure a successful yield.

Fruiting Chamber (optional) – Different strains of mushrooms like to grow in different ways. Popular set-up examples are a monotub, a shotgun fruiting chamber, a ‘martha’ style humidity chamber where mushrooms are grown on trays or blocks, or even on suspended straw columns in a temperature and humidity-controlled room.

We highly recommend doing some research on what mushroom cultivation method will best suit you. A good resource is the ‘Shroomey forum’ – it has a wealth of cultivation advice on growing most strains of mushroom and an active forum of cultivators who can share their experience and knowledge.

How much liquid culture do I need to innoculate one All-in-One Kit?

We recommend using 1-2ml of liquid culture per All-in-One Bag.

What sizes / volumes are your All-in-One Bags

The approximate sizes and volumes of our grain bags are as follows:

  • 1.5kg – 15cm x 12cm x 12cm (approximately 2.16 litres or 2.28 quarts (US measurements)
How long can I store the kit before inoculating?

We offer a 30-day, 100% sterility guarantee. We highly recommend leaving the bags for 1-2 weeks from delivery to validate their sterility before use. We strongly advise using the bags immediately after this period, as all bags are susceptible to contamination due to the nature of the bag having a filter.

How should the mushroom grow kit bags be stored?

All-in-One Mushroom Grow Kit bags are best stored at room temperature and left packed in the box in which they came in. This should stop excessive amounts of air or moisture escaping from the filter. Do not store them in the fridge or freezer, as this could cause excessive condensation in the bag, making your grain over-saturated.

Why do I need to leave the bag a week before using it?

We recommend leaving the bags 1-2 weeks before inoculation as a precautionary measure to self-validate the sterility of the bag. If there are no signs of contamination after 1-2 weeks, you can be assured that your bag is still perfectly sterile as it should be and is ready to use.

Although we have multiple checks to ensure all the grain leaves us in perfect condition, on rare occasions, they can become damaged in transit and subsequently become contaminated. If this does happen, please contact us, and we will arrange for a replacement to be dispatched. Please keep hold of the contaminated bag, as we might need more information from it before we can dispatch a bag to you.

Due to the high risks of contamination during inoculation, please note that we do not offer refunds or replacements for any bag that has already been used.

How is your grain produced?

To make our kits, we first triple-rinse the grain to remove dust or chaff. Next, we soak them overnight in a purified water + gypsum solution to partially hydrate the grains and allow any endospores to activate; adding gypsum provides additional nutrients to the grain, which supports healthy mycelial growth and also stops grains from becoming clumped together.

The partially hydrated grains are then slowly brought to a boil until the grains are hydrated to precisely 55%. We quickly drain the boiling water and immediately distribute the grain on our outdoor drying racks, leaving them to steam off and cool.

This process removes any excess external moisture, resulting in perfectly hydrated grain, which is dry to the touch.

The resulting grain is then weighed into genuine Unicorn bags with an added hydrated mix of Coir, Vermiculite and Gypsum, double-sealed and processed in our industrial autoclave on an extended 125°C cycle for 3.25 hours to ensure all contaminants are killed off.

Once allowed to cool slowly, the bags are individually checked to ensure they are perfectly sterile and only then do we allow them to be dispatched to our customers.

How many mushroom grow kits have you produced to date?

We have provided sterilised grain and grow kits to hobby growers and commercial operations for a number of years. Whilst it’s difficult to put an exact number on it, we know it’s in excess of 100,000 bags. We have also sold countless sterilised substrate bags during our years in business.

How long will it take for the grain section to colonise?

The time it takes for the grain section to fully colonise will depend on many factors. The type and quality of your culture, whether you’re growing from spores or liquid culture, temperature, and even lighting conditions can affect colonisation rates.

If you follow the included instructions, usually within a few weeks on average, and for full colonisation of the bag, nomally just over a month. Inoculating grain bags with spores can be notoriously unpredictable, with germination rates sometimes taking over one month alone.

What yield of mushrooms should I expect from an All-in-One bag?

Different mushroom strains will have different yield expectations. Yields are generally calculated via biological efficiency. Some mushroom strains can produce five or more times that of others, so we can’t give a single answer.

I’ve found a small stone or white bit in my grain, what is it?

Whilst we do our best to remove all traces of foreign matter from our grain, on rare occasions, a very small stone might find its way into our bags from harvesting the grain. This will not affect the bag in any way, nor the colonisation of the mycelium.

Small white clumps within the odd bag will be clumps of gypsum, which we add to the grain.

Gypsum adds essential minerals to the rye grains and can be used as a supplement at almost all stages of mushroom production. Gypsum also aids in stopping the individual grains from sticking together in the bag, allowing for faster and more healthy colonisation – with less chance of contamination.

Why does the colour of the grain vary throughout the bag?

This is totally normal; discolouration can occur due to how the bags are loaded into the autoclave and left to cool after the sterilisation cycle.

Why does the grain appear wet with visible condensation showing in the bag?

Condensation forms in the bag due to fluctuating temperatures during shipping; this is totally normal. The grain can be mixed to allow it to reabsorb the condensation. It should be left for one week before inoculation. The included instructions provide more information on this.


No fuss Shipping, Returns & Guarantee.

  • We aim to dispatch orders within 2 working days (Monday-Friday)
  • Free shipping option for orders over £90.00 - Shipping Policy
  • No questions asked returns & refunds policy - Returns & Refunds Policy

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