These are some of the plants growing in the CuGreen plant lab. All are either sub-irrigated or growing in expanded clay pebble hydroculture. There is no drainage. They are watered on a fixed schedule. All soil based plants are growing in the same artificial soil media. There is no need for "special soil" based on the species of plant. Any terrestrial plant (with roots), including cactus, can be grown and maintained using these methods.
I am writing a how-to guide for what you see here. It will be a free download. Stay tuned.