Portulacas ("moss roses") are wonderful annual plants that take dry conditions very well. They are also wonderful companion plants with the right companions. Last year, I did something that you should NOT do. I planted my portulacas at the base of roses. Why not? Aren't they commonly called "moss roses" anyway? The trouble is that portulaca don't drink nearly as much water as roses. In order to keep my roses happy I had to water them way more than the portulacas appreciated. The roses looked wonderful, but the portulacas under them became straggly, ugly, and developed root rot. The above picture was taken before the portulaca started looking bad. The moral of the story is to do your homework and plant compatible plants together. Live and learn!