Horticultural vermiculite for growing media – 500 g

This horticultural vermiculite is ideal for preparing growing media based on coconut fiber, particularly CVG-type mixes: coconut fiber, vermiculite, and gypsum.

It improves the texture of the growing medium, helps retain moisture, and results in a lighter, more uniform mix that is easier to work with. It is particularly useful for growing in containers, boxes, or single-tube systems.

For wood-decaying mushrooms such as oyster mushrooms, shiitake, reishi, lion’s mane, or pioppino, a sterilized wood-based substrate is generally more suitable than a CVG mixture.

Why use vermiculite in a CVG growing medium?

• Improves the substrate's water retention
• Lightens the coconut fiber-based mixture
• Minimizes compaction of the substrate
• Promotes better moisture distribution
• Helps achieve a more uniform texture that is easier to work with

A convenient format for your CVG recipes

This 500-gram bag is intended for use with approximately two 650-gram blocks of coconut coir.

It makes it easy to prepare your own CVG growing medium by simply adding coconut fiber, gypsum, and hot water.

Estimated CVG recipe

For a 650-gram block of coconut fiber, you can use:

• 1 block of coconut fiber (650 g)
• About 250 g of vermiculite
• 50 to 100 g of gypsum
• About 3.5 to 4 liters of hot water; adjust according to the desired moisture level

After watering, the potting mix should be moist but not soggy. When you squeeze a handful of the mix, only a few drops should drip out. If a lot of water drips out, the mix is too wet.

Usage

1. Place the coconut coir, vermiculite, and gypsum in a clean bucket.
2. Add the boiling water gradually.
3. Close the bucket and, if possible, wrap a blanket or insulation around it to keep the temperature high for longer.
4. Let it sit for several hours to allow the coconut block to absorb all the water.
5. Mix thoroughly until the mixture is smooth.
6. Let it cool completely before using.

Features

• Weight: 500 g
• Type: Horticultural vermiculite
• Uses: CVG substrates, coconut coir mixes, container, box, or monotube cultivation
• A lightweight, mineral-based, and naturally absorbent product
• Use in combination with coconut fiber and gypsum

Advice from La Mycosphère

To ensure a well-balanced growing medium, avoid adding too much water at the start. It’s best to begin with a moderate amount and then gradually adjust the moisture level of the mixture. The final texture should remain loose, crumbly, and not soggy.