Perlite

A lightweight, volcanic mineral that is widely used in gardening to improve soil aeration and drainage. The porous structure creates air pockets in the soil, allowing for better oxygen flow to plant roots and helps prevent waterlogging. It also has some water-holding capacity, helping to maintain a balanced moisture level in the soil. Often included in seed-starting mixes to create an ideal environment for germination and early seedling growth and good for incorporating into soil in pots and containers.