Sunshine® Advanced Rainforest Blend contains coconut fiber for nutrient and water retention. The addition of fine bark provides physical stability for long term growing. The use of compost and worm castings adds a slow release source of nutrients along with beneficial microorganisms. The organic nutrient pack along with humic acid, alfalfa meal and kelp meal gives a good dose of starter fertilizer to get your plants going. And our endomycorrhizal blend enhances the ability of containerized plants to access the nutrients in the root zone.