Cloud Coir is a ready-to-grow, RHP certified, blended coco coir and perlite medium. One of the most important elements a plant needs to grow is oxygen at the root zone. Cloud Coir is a 50/50 blend of perlite and coco coir. Cloud Coir offers the perfect ratio for roots to thrive and not become over saturated, allowing for better nutrient uptake. Cloud Coir has received RHP certification from Holland.