This home grown potting soil is formulated from a fine selection of composted organic materials. This blend is packed full of the organic materials that help your plants become established. Ingredients used are fir bark fines, forest humus, peat moss, perlite, worm castings, bat guano, kelp meal and concentrated seaweed extract. Included exclusive patented technology of ProMoisture Hydrate formulated to keep the biology alive inside the media, thus keeping the intelligence alive. Also Contains Pro-Biotic, the same combination of selected strains of beneficial microbes with endo and ecto mycorrhizae. Mycorrhizae extend the plants root system to assist in improving the plant"s performance and vigor following transplanting. The key difference in Dr. Earth"s potting soil is the broad spectrum soil innoculant. The soil innoculant helps to break down the organic material in Dr. Earth potting soil and aids in overall plant performance. Comes with 13-Quart.