Natural vermiculite for seedlings

Regular price 9,80 €
Regular price Sale price 9,80 €

Vermiculite retains 430 to 470 ml of water per litre and maintains constant moisture around your seeds.

It comes away cleanly from roots at transplanting into your aquaponic system, and it is approved for use in organic growing.

Ref. VERM-10L·Growing medium
Format : 10l
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The summary

  • What you receive: 10 litres of expanded vermiculite, particle size 0.5 to 10 mm.
  • Its own value: 430 to 470 ml of water retained per litre of grow medium.
  • Its neutrality: a pH of 6 to 8 and a conductivity of 2 mS/m.
  • How to use it: 20 to 50% of the volume as a mix, or 5 to 10 mm as a top dressing.
  • At transplanting: it rinses off the roots without breaking them, before they go into the system.
  • Organic farming: suitable for certified production.

Expanded mineral substrate that retains 430 to 470 ml of water per litre, ideal for your seedlings.

Natural vermiculite for seedlings is an expanded mineral grow medium, sold in a 10-litre bag, which holds 430 to 470 ml of water per litre. It makes up 20% to 50% of the volume of a mix, or can be used as a 5 to 10 mm top dressing. It rinses off the roots at transplanting, which avoids introducing fine particles into the aquaponic system.

Vermiculite holds 430 to 470 ml of water per litre and then releases it slowly. This is what keeps your seedlings moist between waterings. It is a mineral from the mica family, heated to around 1,000 °C until its layers open out like a concertina, hence its light weight and water-holding power.

🪨 What its figures are worth

A pH of 6 to 8 puts this mineral very close to neutral, which avoids shifting the comfort zone of your young roots. The conductivity of 2 mS/m is very low, so the material adds no salts and does not skew the reading you take on your solution. The particle size covers 0.5 to 10 mm for 90% of the product, and the whole meets standard NF U 44-551.

Mixed

Vermiculite makes up 20 to 50% of the volume of a potting compost, depending on how thirsty the sown species is.

As a top dressing

A 5 to 10 mm layer laid over the seedling keeps moisture in contact with the seeds.

Only

It is used on its own for very fine seeds, which need steady, even moisture.

🧽 Rinsing before transplanting

This grow medium stands out above all when your plant has to join a water circuit. The flakes come away from the roots under a trickle of lukewarm water, with no need to scrape or pull. Your plants arrive clean in the channel or the basket, and no organic load comes in with them. That is the difference from a seed compost, whose fine particles head for the strainer. The guide on choosing a grow medium reviews the media that are acceptable in a circuit and those to keep out of it, compost included.

The vermiculite and perlite pairing

Combine it with perlite, which does the opposite job by keeping air in the mix. Together, they make a seedling grow medium that holds moisture without smothering the root, and you adjust the proportion of each depending on whether your mix compacts or dries out too quickly. An equal-parts mix suits most seedlings, and you can increase the perlite for species that dislike excess water.

Pure, and for a long crop

What makes it valuable for seedlings becomes a drawback later on. Used on its own for a crop lasting several months, vermiculite holds too much water and the roots end up short of air, so move your plant into a more open grow medium at transplanting. Finally, keep the bag closed and sheltered, as ambient humidity makes the flakes clump together and the product hard to measure out.

🧤 Handling the bag

A bag of vermiculite gives off mineral dust when poured dry, and this dust irritates the eyes and airways. Dampen it lightly before mixing, with a watering can or a sprayer, and the cloud disappears without any change to its properties. For large volumes, work outdoors or in a ventilated space if possible, wearing a dust mask, and avoid stirring it up near your face. Then close the bag carefully, because vermiculite that has absorbed moisture from the air compacts and loses the looseness that makes it easy to incorporate.

Technical specifications

The essentials

Volume
10 LBag ready to mix or spread, with no preparation.
Water retention
430 to 470 ml/LIt is the value that keeps a seedling moist between waterings.
pH
6 to 8Close to neutral: the comfort zone of young roots is maintained.
Conductivity
2 mS/mVery low: no salts added to your nutrient solution.
Particle size
0.5 to 10 mmOn 90% of the product, for a dry matter content of 95 to 99%.
Certification
NF U 44-551, organic farmingSuitable for use in certified organic production.

To budget for separately

Fertilisation
A complete fertiliserThe mineral is inert: nothing comes from it.
A seedling container
Cell tray or potsIt can be mixed or spread out, but it will not hold a shape on its own.

In the box

  • 1 bag of expanded vermiculite of 10 litres

Retention, pH, conductivity, particle size, dry matter, NF U 44-551 standard and mention of use in organic farming: values stated for this product, recorded on 19/09/2026.

Estimate your
delivery time

10-litre bag, very light but bulky: it is the volume that drives the shipping calculation, not the weight. Exact costs are shown in the basket once the address has been entered.

Frequently asked questions

6 questions

6 key questions

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