Vermiculite is a natural mineral obtained from certain rocks. It is mixed with potting soil to enhance a plant’s growth.
This mineral is non-toxic and will not become mold or rot.
It is often used to germinate seeds as it helps in the effective root growth.
What is vermiculite?
This natural mineral is used in many sectors, from the building industry to gardening. It’s the common name for hydrated laminar magnesium-aluminum-ironsilicate. You can find out more about its geology at Mineral Galleries – Vermiculite.
Why is it helpful to gardeners?
You can use it to encourage seed germination and improve soil structure. This is because of its aeration and water-holding properties.
Benefits
It’s a very lightweight material
Does not rot
Improves soil structure through soil aeration
Increases water and nutrient retention
Where does its name come from? It rings a bell…
You may be thinking of ‘vermiculture’, where worms are used to help decompose food waste. Both come from the Latin word ‘vermiculare’ meaning to breed worms.
This is because when vermiculite is heated, it expands into long strands resembling small worms. The American experimenter Thomas H. Webb first named it back in 1824. You can find out more in How Products Are Made – Vermiculite
Where and when should I use it?
You can mix it into composts and it’s great for hydroponic systems. Vermiculite’s insulating properties means it is particularly good when you need to cover seedlings.
What size should I get?
The smallest size of vermiculite is best used to germinate seeds. If you want to use it as a soil improver, opt for the largest size for the best results.
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