Question about a Venus Flytrap and a living rock plant.?

you can't keep the Venus fly trap in you back yard, they will die. They need a very high humidity environment at about 80 or 90%, they usually are kept in a turarium. They do not grow fast at all. I don't know the answeres to the rest of your questions, hope this helps! you may be able to keep the living rock in your sandy backyard, if its a hot climate like the desert. you prob will have to dig it up in the fall.