- HORTICULTURAL CHARCOAL is used in terrariums or potted plants acts as moisture absorbers, helping drain excess moisture while conditioning the soil. It increases the airflow and aeration of the soil, improving its fertility and accelerating plant growth. It also eliminates unpleasant odors that may develop in your terrarium. - ACTIVATED CHARCOAL AIR FILTER: it stores excess water and nutrients, releasing them as the plants need them. Olivette Activated Charcoal naturally facilitates the development of a rich population of microorganisms for better growth and endurance of your plants. - EXCELLENT FOR ALL SOILS TYPES including Orchid Soil, Succulent Soil and Bonsai Soil. It is especially good for plants that prefer moist environments, such as orchids and ferns, by draining stagnant water while increasing oxygen levels. - BEST REVIEWS ON AMAZON! - ECO FRIENDLY CHARCOAL: made from recycled olive pulp, olive pits and olive pruning branches. - CERTIFICATIONS: Carbon Neutral, Organic USDA