They do spread!! But I love them. I had a very cool impatiens once, the Congo Cockatoo, I. niammamensis. Also called I believe African Queen? It did great in there for a while but eventually the heat killed it. They come from 'tropical Africa' but don't seem to be able to take much more than 85F for a long period. Kind of like my Dracula orchids that died a painful (undeath? LOL). But I find the mulch I use on the pathways and into a portion of the beds helps stuff like the episcia and definitely stuff like Epipremnums and creeping Philodendrons like Mamei and Gloriosum and the like have a good substrate for root development.
