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Mycorrhiza powder vs granules: garden hole or hydro

Updated: October 2026

Amazon.co.uk will sell you the same search phrase as granules, powder, pouch and soluble powder, sometimes on products that reviewers say feel like grains. Mycorrhiza powder vs granules is a job match, not a texture contest. Dry garden product belongs on bare roots and rootballs in a hole. A water-dispersible powder belongs in a named hydro system. The [mycorrhiza comparison](/hub/fertiliser-soil-and-bark-mulch/mycorrhiza) keeps the grid. Prices and stars below are from those listings, not a lab test.

Amazon.co.uk will sell you the same search phrase as granules, powder, pouch and soluble powder, sometimes on products that reviewers say feel like grains.

Our top picks

Empathy Empathy Rootgrow mycorrhizal fungi 360 g

Best overall

Empathy Empathy Rootgrow mycorrhizal fungi 360 g
8.8/10about £10.34
View offer
Plantworks Ltd Plantworks Rootgrow mycorrhizal fungi 150 g

Best value

Plantworks Ltd Plantworks Rootgrow mycorrhizal fungi 150 g
8.4/10about £6.79
View offer
TNC TNC MycorrHydro soluble mycorrhizal fungi 75 g

Alternative

TNC TNC MycorrHydro soluble mycorrhizal fungi 75 g
7.2/10about £14.25
View offer
On this page
  1. 1.What the listing word powder actually means
  2. 2.Garden dry for holes and rootballs
  3. 3.Soluble powder for named hydro systems
  4. 4.Gel dip is a different pack

What the listing word powder actually means

Form fields in this set do not line up. Empathy Rootgrow 360 g is granules. Plantworks Rootgrow 150 g is listed as powder, yet UK reviews describe large grains. The RHS 150 g form is simply pouch, with sprinkle-in-the-hole as the method. RootMax and BioTabs say powder. TNC MycorrHydro says powder and then names NFT, flood and drain, and DWC. Ghjkldha says refer to description. Powder on amazon.co.uk is not a fine dust and not a hydro tank. If the page says sprinkle in the planting hole, you have a garden dry product. If it names NFT and DWC, you have a soluble powder. BioTabs and RootMax do not name those systems. Treating every powder as more advanced than granules is the mistake this page is for. Class exclusions stay on the mycorrhiza buying guide.

Garden dry for holes and rootballs

The garden default form is Empathy Rootgrow 360 g granules. Sprinkle them against the outer roots of a pot-grown ball or onto bare feeder roots, then backfill. The 150 g pouches do that job too: reviews describe a sprinkle in the hole, not a dust dissolved in a can. Granules are fiddlier than a true powder. Reviews on the 360 g pouch say they do not stick as well, and one bag arrived with a split seam. That is a handling cost, not a reason to buy a hydro powder for a rose. A solid pot shape sitting on a layer of product, with no root contact, wastes the pouch. Do not water garden granules into a reservoir to make them soluble. The steps are on how to use mycorrhiza.
Empathy Empathy Rootgrow mycorrhizal fungi 360 g

Testsieger

Empathy Empathy Rootgrow mycorrhizal fungi 360 g
8.8/10about £10.34
View offer

Soluble powder for named hydro systems

TNC MycorrHydro 75 g is the only kept listing that names NFT, flood and drain, DWC and hand watering. It is a water-dispersible powder with Trichoderma and bacteria, £14.25, 4.3 from 155 reviews, made in the United Kingdom. Spores still have to reach roots, as a drench or a tank add. It is not a fertiliser. UK reviews say it does not dissolve easily, clogs a watering-can rose and can block narrow lines. One reviewer suggests half the dose. That is their workaround, not the label. Buy this form only if you already run one of those systems. Pouring it into a garden hole wastes a hydro SKU. BioTabs and RootMax stay dry root-contact powders. Ghjkldha mentions hydroponics and soil together without a coherent weight. The 700% root-volume line and the 245 spores per gram were not measured here.

Gel dip is a different pack

Empathy sells a gel-and-granule dip, RG360GEL on the brand site, for bare roots. It is not among the eight kept ASINs. The 150 g pouches here are dry. If you only have a dry pouch, sprinkle for contact rather than mixing a slurry. A listing that says powder is not that gel, and granules can still do bare roots. The RHS 150 g instruction is a dry sprinkle. Garden dry is for holes and rootballs. MycorrHydro is only for a named hydro system. Put the matching form on the roots once.

Common questions

Are Rootgrow 150 g and 360 g different forms?
The 360 g listing is granules. The 150 g Plantworks listing says powder. Reviews describe grains. Both are garden dry products for a planting hole, not a hydro tank powder. The job is the same: contact on roots.
Do I need granules for a pot-grown rootball?
You need contact on the outer roots. Granules on the 360 g pouch do that if you expose the root face. The 150 g grains do the same. A fine hydro powder is not better for a soil pot.
Is a soluble powder better for bare-root roses?
Not in this set. Bare-root roses take a dry sprinkle, or a gel dip that is sold as a separate SKU. TNC MycorrHydro is for named hydro systems and comes with clogging reports. It is the wrong upgrade for a rose hole.
When is TNC MycorrHydro the right form?
When the listing’s systems match yours: NFT, flood and drain, or DWC, and you can tolerate poor dissolving. It is £14.25 and 4.3 from 155 reviews. It is not the garden default.
Will a garden pouch clog a hydro line?
Garden granules and grains are not sold here as tank products. Do not water them into a reservoir. The clogging reports sit on TNC MycorrHydro, the water-dispersible powder.
What is the gel dip, and is it in this comparison?
Empathy’s gel-and-granule dip for bare roots is a separate pack, RG360GEL on the brand site, and is not one of the eight kept ASINs. The 150 g pouches here are dry. Use a dry sprinkle, or buy the gel SKU elsewhere.
Does powder on Amazon mean a fine dust?
No. In this set it can mean grains sold as powder, a blended dry tub, or a water-dispersible hydro product. Read the method and the system names, not the form field alone.

Related pages

Best mycorrhiza

Mycorrhiza

Mycorrhiza buying guide: class, label and pack size

Mycorrhiza for roses when the bed already grew roses

How to use mycorrhiza: root contact, then close the bag

Sources

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.

  1. RHS, Mycorrhizal fungi (retrieved 20 October 2026)
  2. RHS, Trees and shrubs planting (retrieved 20 October 2026)
  3. RHS, Biostimulants (retrieved 20 October 2026)
  4. RHS, Replant disease (retrieved 20 October 2026)
  5. HSE, Biostimulants and plant protection (retrieved 20 October 2026)
  6. GOV.UK, Manufacturing and marketing fertilisers (retrieved 20 October 2026)
  7. AHDB, How should biostimulants be used? (retrieved 20 October 2026)
  8. Empathy, rootgrow 360 g (retrieved 20 October 2026)