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Rootgrow Mycorrhizal Fungi

Rootgrow Mycorrhizal Fungi

From £8.33£10.00 Inc VAT
RHS Endorsed RHS Endorsed

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RHS Endorsement
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Questions (3)

Rootgrow simply speeds up an existing natural process. Fungi contained in rootgrow will begin to colonise the plant or tree roots, extending the root system into the surrounding soil via an extensive network of fungal filaments

Top gardeners like Monty Don recommend using Mychorrizal Fungi when planting bare root plants....check out episode 31 of Gardeners' World on iPlayer.

Rootgrow™  enhances a plants root system so a newly planted plant:

  • Finds more food, finds more water.
  • Needs less fertiliser.
  • Establishes quicker and reduces failure rates (which can be improved even further when used in conjunction with Broadleaf P4)
  • Has increased tolerance to drought and difficult soil conditions
  • These fungi are completely natural and organic and native to UK soils and are suitable for organic growing

Mycorrhizal fungi are widespread throughout nature and are a fundamental reason for normal plant growth and development. Over 90% of all plants associate with these natural organisms as a mechanism for sustained nutrient and water supply.

Shortly after application the fungi contained in rootgrow will begin to colonise the plant or tree roots, extending the root system into the surrounding soil via an extensive network of fungal filaments (up to 20 metres have been recorded in a sugar cube of soil). These thread-like filaments extract nutrients and water from a large soil volume and exchange them for carbon from the plant. This secondary root system, when established, links the root systems of adjacent plants or trees and helps share, more efficiently, nutrient resources throughout the plant community. 

Great for trees, hedges and shrubs also vegetables, flowers and general garden use.

Rootgrow does not work on Brassicas, Rhododendrumms, Azaleas, Heathers, Cranberries or Blueberries

Available in three sizes

  • 360g Pouch
  • 1kg Pouch
  • 2.5 Litre Tub which is approximately 2.5KG

See below for dosage rates.

Dipping gel is provided with full instructions. When mixed together with water, as directed, it will form a perfect dipping solution to ensure maximum coverage of the mycorrhizal fungi on the roots of  plants

Plant Types

Dose rate

Bare Root Trees and Hedging

Note: for best results use rootgrow with gel dip – see packs for more details.

One 360g pack will treat approx 100 x 2ft  bare root

One 1kg pack will treat approx 300 x 2ft bare root
One 2.5 Litre tub will treat approx. 750 x 2ft bare root

Trees and other large root-balled plants

75g will treat up to 15L container grown tree.

 Cell Grown Plants

One 360g pack will treat approx. 125-150 plants.

Seed trays and hanging baskets

Add 1 x scoop or 2 heaped teaspoons per 2litres of compost

Roses, trees, shrubs and plants in containers e.g. vines, ornamentals, climbers

2 scoops or 5 heaped teaspoonfuls for each 5L root ball in the planting hole.

Vegetables e.g. strawberries, leeks, beans, tomatoes, lettuce etc...

2ml or ½ teaspoonful in planting hole when pricking out or planting. 1-2 scoops per metre for seed rows

House plants

Add 5 heaped teaspoonfuls at transplanting or add 1-2 teaspoonfuls into the root zones around the pot.

Turf or other grasses or wild flowers

Add at 2 scoops per square metre (area) or below seeds in row per metre.


rootgrow and the Royal Horticultural Society

When rootgrow was first introduced to RHS gardeners in 2000 it appeared to be an ideal product to fit in with their desire to grow plants with less dependence on chemical fertilisers and using natural, truly organic methods. RHS gardeners then went on to rigorously evaluate the rootgrow to see just how well it actually worked! After 10 years RHS gardeners made the unprecedented move to formally endorse and license rootgrow, the first time a planting aid had ever been deemed worthy of this type of endorsement.

RHS gardeners find plants treated with rootgrow™

  • Have  superior establishment with better natural vigour
  • Overcome replant problems more successfully
  • Have better developed root systems
  • Are better able to cope with conditions of drought
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If I have run out of the gel can I still use the rest of the granules?

Thank you for your question.

The sachet of gel that is supplied with each container should be enough to allow the whole container to be used with the gel, however if you are left with surplus granules you can still apply the remaining as a "Dry Application" as recommended for the planting of any containerised plants.

Sprinkle the granules evenly, at the recommended dosage, directly onto the prepared planting hole or pit. Place the plant directly onto the granules so that the rootzone comes into contact with the granules. If the rootzone is moist it helps the granules to stick to the roots. 

Further information can be found on the packaging

Hope that helps, regards the Trees and Hedging Team

Hi, Is Root Grow Mycorrhizal Fungi suitable for use on acid loving plants and trees? Is Root Grow of benefit to all known plants/ trees...? if not, is there a suitability list? Is there a use by date once the tub has been opened?Thank you for your help

Thank you for your questions

1. Rootgrow is suitable for most 'ericaceous' plants, it will not work on certain species,  these are listed on the packet information - Rhodo's, Azaleas, Cranberries, Blueberries and Heathers. The reason if that these particular species associate with a specific mycorrhizal fungi which is not contained in rootgrow, I should add that treating these plants will have no adverse effects, it will simply not work.

2. Over 80% of land based plants will form a mycorrhizal association, almost all of those found in a garden centre plantaria will benefit from rootgrow treatment, except for those listed as previously mentioned.

3. Once opened the product will be viable for at least a year so long as the granules are kept free from moisture.

Hope that helps, Regards the Trees and Hedging Team

If I buy the 2.5 Litre Tub how long will it remain viable once opened?

Thank you for your question.

The Rootgrow will remain viable once the packaging has been opened for upto 12 months as long as the following conditions of storage have been maintained

  • Not allowed to come into contact with any moisture
  • Is kept in an airtight container
  • Is stored at a cool temperature, but not below -5C
  • Is not allowed to heat up during storage

Regards the Trees and Hedging Team

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