Perfect Plant's Organic Perlite is an excavated mineral rock that comes from volcanic rock or glass. It is typically mixed with potting soil to help manage aeration and drainage of soil for potted plants. Is perlite organic? Yes, it comes from the earth! The mineral has a neutral pH and is light-weight and porous creating air pockets within the soil that alleviate stress on roots and retain water. Perlite has been shown to help maximize root growth while lessening the stress of drainage management for gardeners with containerized plants. Use perlite for growing plants. Simply mix perlite for plants with a multi-purpose potting mix or seed starter before planting. Perfect Plant's Perlite comes in a 1315 heavy-duty, re-sealable bag perfect for storage or later use.