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Agar & Additives

4.88 out of 5
(8 customer reviews)

£3£130 (incl. VAT)

Agar is a gelatinous substance obtained from seaweed. When mixed with water, heated, and allowed to cool, ‘agar agar’ forms a solid gel which is used as a growth medium to make agar petri dishes.

Agar itself is non-nutritive and is typically mixed with various nutrient bases and optional additives to provide food for the mushroom mycelium, thus ensuring optimal growth.

If you are interested in mycology and want to further your skills, you must get used to using agar. It is the best way to make clean cultures, analyse mycelial growth, make transfers, and ensure you have clean spawn.

All agars and additives listed are premium grade and are the same ones we use in our own lab so you can be assured of their quality and freshness. Don’t settle for old stocks and cheaper quality alternatives.

More Information & Instructions Below.

Individually packed and made to order from fresh stocks. Packaged in air-tight mylar bags.

Free Delivery Option for all orders over £60

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£3£130 (incl. VAT)

Purchase today to earn 3-130 POINTS worth £0.15-£6.50 to redeem on your next order.
Purchase today to earn 3-130 POINTS worth £0.15-£6.50 to redeem on your next order.
SKU: agar-additives-mycology Categories: , Tag:

Frequently Bought Together

100% Agar Agar

Pure lab grade Agar Agar. High gel strength.

Malt Extract (ME)

Our premium Malt Extract is made from malted barley and used as a nutritional additive to agar formulas to promote strong mycelial growth.

Light Malt Extract (LME)

Lighter in colour than our traditional Malt Extract. Our premium Light Malt Extract is also made from malted barley and used as a nutritional additive to agar mixes.

It’s personal preference as to which one you use, we use them both depending on what culture we’re analysing.

Potato Dextrose Agar (PDA) – PRE-MIX

A pre-mixed blend of the classic potato dextrose agar. Used extensively by cultivators around the world. An excellent formula for all mushroom species. When set, PDA is light in colour.

Soy Peptone (SP)

Our premium, lab grade Soy Peptone is used as a nutrient, vitamin and protein additive to agar. A non-GMO product that provides a full nutrient spectrum to your agar mixes. Lab grade and suitable for use in mycology, microbiology and fermentation.

Soy Peptone Yeast Extract Agar (SPYEA) – PRE-MIX

The king of agar mixes, our own in-house formula which we use extensively in our lab. A mix of premium ingredients including agar, soy peptone and yeast extract which provides an optimal and balanced agar blend resulting in the the perfect substrate for any type of mushroom culture.


Dextrose is a simple sugar/monosaccharide derived from corn and is chemically identical to glucose. Dextrose is used as a simple nutrient additive in agar formulas to support strong mycelial growth.


Store all Agar and Agar Additives in a cool dark place away from heat and direct sunlight.

8 reviews for Agar & Additives

  1. 4 out of 5

    Mr Cornhill

    High quality agars and pre-mixes. Good price. Should keep me going for a bit. Fast and discreet shipping. Only given 4 stars as not yet used.

    • Paul T. (Founder)

      Thanks for your review Mr. Cornhill! Keep us posted with how you get on! These are the best agars and mixes we've ever used, used extensively in our own lab. Enjoy! Paul

  2. 5 out of 5

    Charlotte Henderson

    I use this in the kitchen and for growing mushrooms, economical when buying in bulk and better quality than cheaper alternatives.

  3. 5 out of 5

    Jessica B.

    Malt extract was sent instead of LIGHT malt extract. Contacted Paul, gave me a refund and sent out a free replacement next day. Can't really fault the customer services. Mistakes happen and it was a large order. Thanks Paul 🙂

    • Paul T. (Founder)

      Hi Jessica,

      Yes, many apologies, that was my fault, I remember it being a VERY busy day and one of our helpers was off! Thanks for the kind review and understanding 🙂

      Paul x

  4. 5 out of 5

    Jewels & Co…

    This is my second order now, ordered some for my friend too. Sent it sealed bags, well-packaged and fresh. I'll be back for some more at at a later date!

  5. 5 out of 5


    It's amazing to see the difference in speed of growth and vitality when using different agars on certain strains. Mushrooms will continue to amaze me. Thanks

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