Perlite is a lightweight, porous volcanic glass that’s been heated and expanded to create tiny white, airy granules. It’s widely used in horticulture for its excellent drainage and aeration qualities.
 
Uses for Plants:
Perlite improves soil aeration and drainage by creating air pockets in potting mixes. It helps prevent waterlogging and root rot by allowing excess water to drain freely while keeping the soil light and fluffy. It’s commonly mixed into potting soil for vegetables, flowers, and houseplants to promote strong root development.
 
Uses for Orchids:
Orchids benefit from perlite because it helps keep their roots dry and well-ventilated, which is crucial to avoid rot. Perlite is often combined with bark or coco chips in orchid mixes to enhance airflow and moisture control, especially for species that prefer fast-draining media.
 
Uses for Terrariums:
In terrariums and vivariums, perlite can be used as a drainage layer beneath the soil or substrate to prevent water from pooling at the bottom. This helps maintain healthy humidity levels without waterlogging plant roots or harming amphibians and reptiles. It also promotes good airflow and keeps the substrate from compacting.
 
Disclaimer: While perlite is great for drainage and aeration, it can be harmful if ingested by reptiles, amphibians, or insects. Care should be taken when using perlite in enclosures housing such animals, and it may be better to avoid it or use it only in sealed layers inaccessible to them.