Thats cool. Cacti are pretty sweet. Joshua Trees are one of my favorite plants on the planet. Not if sure if they are trees or cacti, I do know they grow an inch a year and there are several in Joshua Tree National Park that are almost fourty feet tall. I have had the privilege of seeing them first hand, as have many others. I have several potted succulents that I have had for over a year, very slow growing but still interesting.