Natural pumice. the size is about 1/8". There are a lot of advantages of having pumice in the soil: 1. Planting with pumice also has the advantage of a neutral pH along with a variety of trace materials. 2. It reduces water runoff and fertilization by increasing soil absorption in sandy soils. 3. It also absorbs excess moisture so roots don't rot. 4. Providing excellent aeration to the soil. Plant in the picture is not for sale. Let me know if you have any question. Here are the options in this list: 1 quart is 1.4lb, 2 quart is 2.8lb, 5 quart is 7lb, 10 quart is 14lb.
