Organic soils are the backbone of organic indoor gardening. HTG Supply carries a variety of organic soils from top brands like FoxFarm, Roots Organics, Organic Mechanics, Pro-Mix, and more! Peace of mind is perhaps the greatest element to organic gardening, having confidence in …what comes pre amended in your soil sure beats the heck out of mystery-meat miracle grows. In fact, who needs miracles when you’ve got an excellent peat and coco base with worm castings, bat guano, alfalfa meal, and a whole host of organic amendments? Find the perfect organic soil to meet your garden’s requirements below.