Harris Succulent & Cactus Potting Mix is a balanced blend of premium quality Forest Humus, Pumice, Compost, Perlite, Sphagnum Peat Moss, Fish Bone Meal and Limestone to provide the best drainage and stability for your succulents and cacti. This blend is designed for excellent drainage and water holding capabilities at the same time! Great for all indoor and outdoor cactus, succulents and drought tolerant plants. Most succulents are slow growing. The key to optimal growth is well-drained soil. As a general rule, fast growing species should be repotted every two to three years and slow growing species every three to four years.