The best mycorrhizal fungi, compared.
Top pick: BioTabs Mycotrex 100 g Best value: Plantworks Rootgrow mycorrhizal fungi 150 g – Lowest named price in this capture, about £6.79, with 4.5 from 2,948 reviews, for a short session. Updated October 2026.
A mycorrhiza product is a packaged fungal inoculant that has to touch living roots when you plant or pot. In the UK you use it for roses, shrubs, hedges, fruit and containers, and sometimes for a hydroponic system. The Royal Horticultural Society describes the partnership as an extension of the root for water and nutrients, most plausible in peat-free compost or in soil that has been worked hard. A suitable pouch matches the fungal class to the plant. A standard arbuscular inoculant suits most vegetables, roses and shrubs. It does not suit brassicas. Rhododendrons, azaleas, heathers, blueberries and cranberries need an ericoid product. Granules or powder belong on the roots. Watering them over the surface wastes them, and a phosphorus-rich fertiliser in the same hole can suppress the fungus. Prefer a named product whose pack weight agrees with itself. Dry granules suit open ground. A water-dispersible powder suits a named hydro system only if you can tolerate blocked lines. Class, exclusions and pack size are set out in the [mycorrhiza buying guide](/hub/fertiliser-soil-and-bark-mulch/mycorrhiza/sub/mycorrhiza-buying-guide).
A mycorrhiza product is a packaged fungal inoculant that has to touch living roots when you plant or pot. In the UK you use it for roses, shrubs, hedges, fruit and containers, and sometimes for a hydroponic system.
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Personal buying guide
Question 1 of 2
Where will you put it?
BioTabs Mycotrex is a 100 g powder at about £28.98 that lists nine endomycorrhizal species plus rhizobacteria, seaweed meal, and humic acid. The star line is 5.0 from three reviews, and the capture has no UK review text, so that perfect score is not a British sample. A bullet claims 700% more root volume; there is no test report in the file. Certified organic appears as a listing bullet without a licence number. Stated use is root development and soil conditioning; a hydroponic browse rank is not a system claim. At about 29 pence per gram against about 3 pence per gram on Rootgrow 360 g, it is the dearest powder here on a shelf-price rule of thumb. It is a blended listing, not the default garden pick.
Pros
Cons
Best for: You already buy BioTabs blends and accept three ratings as the evidence.
Less suitable: A first garden pouch when you wanted thousands of UK reviews or a low price per gram.
Specifications
Common questions
What does the listing say is in the tub?
Nine species of endomycorrhizal spores, rhizobacteria, seaweed meal, and humic acid.
Is the 700% root-volume line a measured result?
It is a bullet on the listing. The capture has no test report and no UK review text.
Does the listing state a hydroponic system?
Stated use is root development and soil conditioning. A hydroponic browse rank is not a system claim.
Empathy’s 360 g Rootgrow pouch is listed as granules at about £10.34, with Plantworks Ltd as manufacturer and model RG360. Across 2,864 amazon.co.uk reviews it sits at 4.6, and the 50 saved texts describe stronger growth on tomatoes, squashes, roses, shrubs, and bare-root hedging in stony soil when the granules coat the roots. Reviewers also say spreading the product and watering it in like fertiliser is waste, and that the granules are fiddlier than a powder and do not stick as well. The same capture prints item weight 25 g and liquid volume 360 ml, which disagree with the 360 g unit count. One pouch arrived with a burst side seam and spilled pellets; seller contact got no reply. Organic status is only a customer question. It is the top pick here for a named garden inoculant with a large UK sample, not because we ran a lab test.
Pros
Cons
Best for: You are planting roses, shrubs, hedges or containers and want a named 360 g garden pouch with a large UK review sample.
Less suitable: Brassicas, blueberries, rhododendrons, or a hydroponic tank that needs a soluble powder.
Specifications
Common questions
What form is this Rootgrow pouch?
The listing form is granules, unit count 360 g. The same capture also prints item weight 25 g and liquid volume 360 ml, which do not match the name.
Does the listing say it is organic?
Organic is only a customer question on the page. No organic certification field is in the capture.
How do reviewers say to apply it?
UK reviews say the granules need to touch the roots. Spreading them and watering them in like fertiliser is described as waste.
The RHS-branded 150 g pouch is about £7.59 and tells you to sprinkle it at the bottom of the planting hole. The star line is 4.6 from 92 reviews; only 19 UK review texts were saved, far thinner than the thousands on the other Rootgrow pouches. Those texts mention seedlings, bare-root roses, chillies, tomatoes, and shrubs, and several call a small amount in the hole enough. Manufacturer is Empathy; target species are flowering plants, trees, shrubs, and edibles. Vegetables appear only as a customer question. One reviewer treats the sprinkle as what makes replanting a rose in an old bed possible, which is stronger than the listing. It does the same garden job as the other Rootgrow pouches, with less review evidence and a slightly higher capture price than about £6.79.
Pros
Cons
Best for: You specifically want the RHS-branded 150 g pouch and accept a thinner review sample.
Less suitable: You want the largest UK review count or the lowest 150 g price in this capture.
Specifications
Common questions
How does the listing say to apply it?
Sprinkle at the bottom of the planting hole.
Which plants are named?
Flowering plants, trees, shrubs, and edibles. Vegetables appear only as a customer question.
How many UK reviews are in the capture?
The listing line is 4.6 out of 5 from 92 reviews. The saved listing contains 19 UK review bodies.
The Plantworks 150 g Rootgrow pouch is about £6.79, the lowest named price in this capture, with 4.5 from 2,948 reviews. Saved UK texts say a little goes a long way: one buyer used half a pack on two crab apples and five dwarf apples and expected the rest to last into the next season. Reviewers sprinkle it into the hole so it touches roots, including rose cuttings and new shrubs. The listing form says powder, yet several people describe large grains and say they expected a dust. A buyer who ordered two packs says neither contained a scoop. Moisture and soil in an opened packet are blamed for a shorter life. It is the best value small-session pouch here on price and review depth, not a different fungus from the 360 g granules.
Pros
Cons
Best for: A short rose, shrub or pot session when you want a named 150 g pouch without paying the 360 g price.
Less suitable: A long hedge row, ericaceous plants, or a hydro system that needs a soluble powder.
Specifications
Common questions
Is this the powder or the granule pouch?
The attribute form is powder. UK reviews in the same capture describe large grains and say they expected a powder.
Which plants does the listing name?
Target species are flowering plants, trees, shrubs, and edibles. Indoors is only a customer question.
Is a scoop in the box?
Included components lists the 150 g product only. A reviewer who bought two packs says neither contained a scoop.
Grow Mate’s RootMax listing is a pack of two at about £33.78, with the title saying 200 g and unit count 400 g. Across 2,208 reviews it sits at 4.5, and saved texts mention rose cuttings, strawberries, pumpkins, tomatoes, and indoor plants moved into pon or leca. The title also says rooting powder next to mycorrhizal fungi; one reviewer used it with honey on cuttings, which is their method, not a listed instruction. A strength bullet names Glomus intraradices at 245 spores per gram, which we did not measure. Buyers criticise the price, say the pack looks smaller than the photographs, and one saw little benefit on salad leaves. Another reports a benefit on brassicas, which the listing does not explain. It is a twin dry garden powder with a large sample, not a reason to skip the cheaper named Rootgrow pouches.
Pros
Cons
Best for: You wanted two dry pouches in one parcel and will still put the powder on roots.
Less suitable: A single small session, or anyone confusing this with cutting hormone.
Specifications
Common questions
Is this one tub or two?
The title says 200 g and pack of 2. Number of packs is 2. Unit count and item weight are 400 g.
Why does the title say rooting powder?
Those words are in the title next to mycorrhizal fungi and direct-to-root inoculant. The strength bullet names Glomus intraradices at 245 spores per gram.
What organic wording is on the listing?
A bullet says certified for organic use. No licence number is in the capture.
TNC MycorrHydro is a 75 g water-dispersible powder at about £14.25 for NFT, flood and drain, DWC, and hand watering, with added Trichoderma and bacteria. Country of origin is the United Kingdom. The amazon.co.uk line is 4.3 from 155 reviews, and 16 saved texts praise indoor living-soil beds and DWC use while also saying it does not dissolve easily. Reviewers report a clogged watering-can rose, blocked narrow lines, and one dark mix that clogged roots after they switched from another brand. Liquid volume 500 ml conflicts with a 75 g powder. Listing sentences about fewer nutrients and lower pathogen pressure are seller claims, not an authorisation. It is the only kept listing that names those hydro systems, not a garden-hole granule substitute.
Pros
Cons
Best for: A named hydroponic system when you can tolerate clogging risk.
Less suitable: Open-ground roses, shrubs, or anyone watering garden granules into a tank.
Specifications
Common questions
Which systems does the listing name?
NFT, flood and drain, DWC, and hand watering. The powder is described as water dispersible, with added Trichoderma and bacteria.
Do UK reviews mention dissolving?
Yes. Reviewers say it does not dissolve easily, clogs a watering-can rose, and can block narrow lines or roots.
Where is it made, on this listing?
Country of origin is United Kingdom. Manufacturer is The Nutrient Company.
Ghjkldha’s title says 100 g root grow mycorrhizal fungi at about £7.59. Brand and manufacturer are Ghjkldha, country of origin China; Empathy is not on this capture. Unit count is 1.0 ml, a bullet says 100 g, and item weight is 132 g, so you cannot quote one pack size. Form is “refer to description”, and ingredients are not stated. The star line is 4.3 from five reviews; only two thin UK texts were saved, one calling it brilliant and another saying a little goes a long way but the difference is not large. Bullets name hydroponics, mixed culture, and soil plus general houseplants. It is a lookalike title, not Empathy Rootgrow.
Pros
Cons
Best for: Only if you will treat it as an unknown generic and check the parcel weight.
Less suitable: Anyone who wanted a named Empathy or Plantworks pouch.
Specifications
Common questions
How much product does the listing claim?
The title and a bullet say 100 g. Unit count is 1.0 ml. Item weight is 132 g.
Is this Empathy Rootgrow?
No. Brand and manufacturer are Ghjkldha, country of origin China. Empathy is not on this capture.
Which systems do the bullets name?
Hydroponics, mixed culture, and soil culture, plus general houseplants and gardens. Ingredients are not stated.
The Plantworks bundle is Rootgrow 360 g plus a 500 g bulb starter at about £22.78. The starter also contains Rootgrow, vermiculite, seaweed extracts, and humates, and the bullet says it covers 50 bulbs. The star line is 4.0 from two reviews, and there is no saved review text, so you have listing copy only. Form is listed as powder, mixture. Browse nodes include garden fungicides and moss control; those are Amazon ranks, not a pesticide claim in the bullets. You are paying for two jobs; roses and shrubs do not need the bulb starter. It is a bundle SKU, not a larger single pouch of the 360 g top pick.
Pros
Cons
Best for: You already planned to plant about 50 bulbs and wanted Rootgrow in the same box.
Less suitable: Rose or shrub planting with no bulbs, or anyone wanting review depth on this ASIN.
Specifications
Common questions
Is this only a larger pouch of Rootgrow?
No. The title is Rootgrow 360 g plus a 500 g bulb starter that also contains Rootgrow, vermiculite, seaweed extracts, and humates.
How many bulbs does the second product claim to cover?
The bullet says sufficient for planting 50 bulbs.
How many reviews support the star line?
The capture shows 4.0 out of 5 from 2 reviews, and it contains no review text.
Eight amazon.co.uk listings were scored from the stored pages and the UK review notes already on file. The digest dates the regulatory note to 20 October 2026. There is no laboratory test. A spore count, a root-volume line or an organic bullet is the seller's claim. Where two pack-size figures on one listing disagree, both stay and the clash is a deduction. A 4.6-star row does not mean the pouch suits blueberries or brassicas. The highest score is the top pick. The best value is the lowest named 150 g price, and it does not also take the top score. The weights below sum to 100.
Amazon evidence
35%Star rating on amazon.co.uk, then the size of that listing's review file. The 360 g pouch at 4.6 from 2,864 and the 150 g pouch at 4.5 from 2,948 carry this block. Three reviews, or two, add almost nothing.
Label coherence
30%A brand, a model and a pack weight that agrees with itself. A clash between 100 g, 1.0 ml and 132 g, or between 25 g and 360 ml on a dry pouch, is a deduction. A lookalike title is not scored as the named brand.
Fit for the job
20%Garden granules or powder for a planting hole, versus a soluble powder that names NFT, flood and drain, and DWC. A standard inoculant does not score as a fit for brassicas or ericaceous plants.
Value
15%Shelf price for the pack you will finish. The 150 g pouch at about £6.79 is the best value on that rule. About 3 pence per gram on the 360 g pouch versus about 29 pence per gram on the 100 g blend is a rule of thumb from those shelf prices, not a laboratory cost.
Buy the fungal class and the form before you buy the star line. A garden pouch, a hydro powder and a lookalike title are not one list. Prices below are amazon.co.uk shelf prices from the category captures. This is not a laboratory test.
Mycorrhiza on amazon.co.uk, for this category, means a packaged fungal inoculant that has to touch living roots at planting or potting. You are usually planting roses, shrubs, hedges, fruit or containers. A smaller group is buying for hydroponics. The Royal Horticultural Society describes the partnership as an extension of the root for water and nutrients, most plausible in peat-free compost or soil that has been worked hard. A star line is not a laboratory test.
Granules and powder have to touch the roots. Spreading them and watering them over the surface wastes the pouch. The RHS also says not to add fertiliser at the same time, because phosphorus can suppress the fungus.
Brassicas are an exclusion. Blueberries, rhododendrons, azaleas, heathers and cranberries need an ericoid product, which is not among these eight listings. Empathy states those limits on the rootgrow 360 g page.
No listing here cures rose sickness, honey fungus or pythium. Replant advice is a soil swap, about 60 cm wide and 30 cm deep. A sachet is a manufacturer claim under evaluation, not a cure.
Standard arbuscular inoculants suit most vegetables, roses and shrubs. They do not suit brassicas. Ericoid plants need a different product, and that product is not in this set. Granules or powder belong on or against the roots at planting. Watering them in like liquid feed wastes them. Do not add a phosphorus-rich fertiliser in the same hole. Hungry crops still need feeding later. A result in the first week is not what the category promises.
Dry granules or powder suit a planting hole. A 150 g pouch is a short session. A 360 g pouch treats more pots and hedging. A water-dispersible powder is only useful if the listing names the hydro system, and clogged lines are a reported drawback. A twin pack is still a dry garden powder. A bundle that adds a 500 g bulb starter is a second job, stated for 50 bulbs, not a larger single pouch of fungi. Shelf prices in the captures run from about £6.79 to about £33.78.
Three typical situations, each with a recommendation from this comparison.
You want one application in the planting hole and a named pouch with thousands of UK reviews. Empathy Rootgrow mycorrhizal fungi 360 g is the top pick at about £10.34, with 4.6 from 2,864 reviews. Put the granules on the roots. It does not suit brassicas, blueberries or rhododendrons.
You are planting a few roses, shrubs or pots and you do not need the 360 g pouch. Plantworks Rootgrow mycorrhizal fungi 150 g is the best value at about £6.79, with 4.5 from 2,948 reviews. The listing says powder, and reviews describe grains. A long hedge row will use the larger pack.
You run NFT, flood and drain, or DWC and you can tolerate clogging. TNC MycorrHydro 75 g is the only kept listing that names those systems, at about £14.25, with 4.3 from 155 reviews. Reviewers say it does not dissolve easily. Do not water garden granules into the tank.
The top pick for roses, shrubs, hedges and containers is Empathy Rootgrow mycorrhizal fungi 360 g at about £10.34. It is a named granule pouch at 4.6 from 2,864 reviews, and saved reviews describe root contact at planting. The same capture prints an item weight of 25 g and a liquid volume of 360 ml against a 360 g unit count. The best value is Plantworks Rootgrow 150 g at about £6.79, with 4.5 from 2,948 reviews, for a short session. The listing says powder while reviews describe grains. TNC MycorrHydro is the soluble powder that names NFT, flood and drain, and DWC, with clogging reports. The generic title is not the Empathy pouch. None of these scores is a laboratory test, and none of these products cures rose sickness.
Plantworks Rootgrow mycorrhizal fungi 150 g
Lowest named price in this capture, about £6.79, with 4.5 from 2,948 reviews, for a short session.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK and maker sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the eight amazon.co.uk listings in that digest. An organic bullet is not a licence number. A root-volume line and a spore count were not measured here. No pouch is treated as a cure for rose sickness or as a UKCA-approved biostimulant.
Expert source (DIY & tools): Lee Burkhill (Garden Ninja) (external profile) – public expert commentary used as a research source, not as a contributor to our pages.
This page contains affiliate links to amazon.co.uk (tag pcuk26-21). If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are from the listings. This is not a laboratory test.
