Potting mix soil consist of perlite, peat moss, and vermiculite (311 respectively). We use this soil mix for Mexican Butterworts with great results on all our Pings. Make sure to add water to the soil mix before potting your new plant for best results. We also recommend that you let the soil mix dry out before adding more water to the media to avoid root rot and brown heart disease. This listing is for a ziploc sandwich bag of soil (about a 16oz cup of soil).