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Inerts grow mediums

What is an inert substrate ?

The inert substrates are substrates that are decontaminated and that contain no bacteria nor microbes. What we call the modern culture (hydroponics) concerns the plants that grow in an inert and sterile substrate that are clay pellets, rockwool, coconut fibre and the Speed Grow. These different substrates have no nutritive elements and so, make the constant nutritive content necessary and evolving by means of water. We can only count on organo-mineral fertilisers to use hydroponic systems. These lasts can stay in a solution approximately 10 days.

The most inert supports used in domestic hydroponic systems:

The clay pellet constitutes the most simple and the most handy growing middle for people who make this kind of culture, whether they are novice or confirmed growers. Effectively, thanks to its ability to drain, to keep a little bit the nutritive elements and to offer a big oxygenation to the roots, the clay pellets accept the continuous or alternating ebb and flow.

The rockwool is also a widespread growing middle, especially for professional horticulturists; Most of the tomato growings (food-processing industry) are carried out with this substrate.

Well-known for its ability to hold water and the nutritive element, the irrigation with the rockwool has to be made with a lot of precautions by the cultivator considering the fact that it has to be programmed and homogeneously spaced during the plant lighting time in order to meet the needs of water and nutritive elements.

In practice, the informed grower will have to take into account the rockwool volume used, the weather conditions according to his growing space and the ability of the plants to assimilate their complements according their growth and bloom stages, to programme his tides and the time with the help of a digital, mechanical or cyclical timer.

Practical information !

In concrete terms, the more the plants evolve, the more they need water and fertilisers. However, tides that are too close to each other or too abundant could generate an oxygen rarefaction around the roots and a risk of moisture.



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  • Speedgrow Rack 84

    Rack 84 (Speedgrow)
    Taking of cuttings or germination rack of 84 earthwool (Rockwool with natural binder) rooting corks (38x40mm) created from organic substances. It is not neccesary to rinse and mop it (regulated PH). 
    Type:RFX
    Ready to be operated
    Learn More
    €12.00
  • Speedgrow Rack 126 SPG

    Rack 126 (Speedgrow)
    Taking of cuttings or germination rack of 126 earthwool (Rockwool with natural binder) rooting corks (26x40mm) created from organic substances. It is not neccesary to rinse and mop it (regulated PH). 
    Type:RFX
    Ready to be operated
    Learn More
    €12.00
  • Speedgrow Rack small hole 7x7x6.5

    Speedgrow Block small hole 7x7x6.5

    The Speedgrow blocks are created from earthwool (rockwool with a natural binder) and so, from organic substances.
    The grooves are redesigned to have a better drain.
    The rooting cubes are perfects to all the block's holes.
    The block can be placed on a slab to offer a greater growth volume.
    It offers  the volume to grow the biggest plants.
    You can growth all the cycle only with the block volume, it's not necessary to put the block on the slab.
    Learn More
    €0.66
  • Speedgrow Rack big hole 7x7x6.5

    Speedgrow Block big hole 7x7x6.5

    The Speedgrow blocks are created from earthwool (rockwool with a natural binder) and so, from organic substances.
    The grooves are redesigned to have a better drain.
    The rooting cubes are perfects to all the block's holes.
    The block can be placed on a slab to offer a greater growth volume.
    It offers  the volume to grow the biggest plants.
    You can growth all the cycle only with the block volume, it's not necessary to put the block on the slab.
    Learn More
    €0.66
  • Speedgrow Rockwool big hole 10x10x7.5

    There are Blocks of rockwool of 10x10x7.5 cm Speedgrow.

    Their slots have been changed to improve drainage, combined with slapping and you'll be able to create a hydroponic cultivation where the plant grows healthy and strong.

    Learn More
    €0.66
  • Speedgrow Slab 100x15x7.5

    Slab 100x15x7.5 (Speedgrow):
    Created from earthwool (rockwool with natural binder) and organic substances.
    Learn More
    €5.50
  • Speedgrow Cubes small hole 10x10x7.5

    Speedgrow Block small hole 10x10x7.5

    The Speedgrow blocks are created from earthwool (rockwool with a natural binder) and so, from organic substances.
    The grooves are redesigned to have a better drain.
    The rooting cubes are perfects to all the block's holes.
    The block can be placed on a slab to offer a greater growth volume.
    It offers  the volume to grow the biggest plants.
    You can growth all the cycle only with the block volume, it's not necessary to put the block on the slab.
    Learn More
    €0.66

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