Well actually plants will never stop growing. Given poor light levels, they will slow simply because the lack of photosynthesis prevents them from being able to produce new growth. When light levels increase they will take off. They are safe for frogs if that's what you are concerned about but will get big. I recently pulled all of my vines out of my 40 because they took over! IMO plants don't seem big in your house, but once you put them in a little glass box, they are a lot bigger!