its mostly dyna rok or dolomite as some have said. dyna rok is the brand and the name of this stuff... I love it for everything. has some bark and charcoal mixed in also. This one gets watered when it gets dry. They like water but they don't like to sit in it for long. If they have the light the air and heat they don't mind the water at all. They just have to use what you give them up in a short span...
These flowers smell great also to. Its an elusive fragrance that you have to dive in like a beee for over and over bec it fades so fast... A very therapeutic type aroma