How Much Perlite To Mix With Soil?

How Much Perlite To Mix With Soil?

Pearlite is an amorphous volcanic glass with a relatively high water content, typically formed by obsidian hydration. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently.

Perlite works well with plants, including cacti, roses, vegetables, herbs, and flowers. The porous nature of perlite allows water to drain quickly through the soil, so there’s less risk of root rot or over-watering your plants. It doesn’t hold onto moisture like other materials.

The perfect ratio of soil and perlite for the best result is stated below.

Perfect Ratio for Perlite

The perfect ratio of perlite in the soil is 1:4. That means there should be 20-25% of perlite in soil for optimal results. That way, the soil will retain enough water, but perlite will also prevent any root rot due to overwatering or unpredicted rain.

Effects of too Little Perlite

If you add any less perlite than the perfect ratio, there is a chance that the soil absorbs too much water. Especially in case of rain or overwatering accidentally, there is a massive chance of extra water retention. That will cause the plant’s roots to rot in different places, affecting your plant’s growth. So to avoid over absorption of water, don’t add too little perlite. 

Effects of too Much Perlite

Adding too much perlite will make the soil porous and will aid in too much aerification. This will cause the water to flow out of the soil, and water retention will become impossible. The plant won’t get enough water due to the porous nature of the soil and the ratio of water and air will be disturbed. All of this will eventually affect the growth of the plant.

Uses of Perlite

Perlite is used worldwide to provide the optimal combination of aeration and water retention to help in achieving the perfect soil qualities. This can help manage the soil according to the geographical attributes of soil, the plant you are growing, and how much water the soil needs.

To learn more about the formation of perlite, and its uses, visit us on

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