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The Water Holding Capacity (WHC) of a growing media measures the amount of water that a growing media can hold without causing plant stress. The WHC is largely determined by the amount and type of pore spaces available in the growing media, however the height...

The pH measures the hydrogen ions in the growing media, while EC (electrical conductivity) measures the soluble salts in the mix. For optimal plant health, the pH and EC of the growing media should be in accordance with the plant’s requirements because different plants can...

The pH measures the hydrogen ions in the growing media, while EC (electrical conductivity) measures the soluble salts in the mix. The pH and EC of the growing media should be in accordance with the plant’s requirements because different plants can have different preferred pH...

The air filled porosity (AFP) of a growing media is the percentage of its volume that is air after being saturated with water and just after it has stopped draining. This is the method used in the Australian Standard for Potting Media for testing AFP....