What perlite contributes to a mix

Perlite is a lightweight expanded mineral commonly included in growing media. Its conspicuous white particles can make a potting mix look as though it contains foam, but the material has a different role.

It helps create an open structure and can influence drainage and aeration. The effect depends on particle grade, proportion, and the other ingredients in the blend. Adding a handful to any difficult soil is not a guaranteed repair.

Use a product with a purpose

Choose horticultural material and follow handling guidance on the bag. Avoid breathing dust; work carefully, use recommended protection, and dampen dusty material as directed. Do not substitute unknown building products simply because they look similar.

If a prepared mix already drains appropriately, it may not need alteration. Changing it can also change how often you need to check water and how well a small root ball maintains moisture.

The useful question is not whether perlite is good or bad. It is what property you are trying to change. Compare a small tested blend before committing every plant to it, and keep the recipe by volume. An ingredient becomes informative when you can connect it with the behavior of the finished medium, rather than expecting the ingredient's name alone to predict success.