Lin, for your input about changing the soil. I had serious questions about that. I have a lot of plants that I need to change to a more gritty, less peaty mix. I keep trying not to overwater and the soil becomes too dry, or too wet at the bottom and dry at the top, thus killing the roots. When I get a box store plant in a large pot, I almost always remove the bottom 1/3 to 1/2 of the soil, because as said above C & S have shallow root systems. I had to learn the hard way.