Perlite is a natural mineral that exists in nature as a type of volcanic glass. It forms when water saturates volcanic obsidian glass over a period of time...
The little white balls you see suspended in your soil mix are known as volcanic popcorn. Perlite is mainly water and when heated y the manufacturers at high temperatures, it pops just like the normal popcorn does...
You can buy perlite in significant amounts from your favorite outlets and online stores like Lowes, Home Depot, Amazon, eBay, your local nurseries, and hydro shops.
Perlite is very affordable and you can buy large bags of perlite for little money...
Most gardeners do not know the benefits of using perlite to improve aeration and drainage to their soil. When you add this mineral you will begin to notice a significant difference in the health of your garden during summer...