[Cynthia, Prescott, AZ]

Your failing plant may have contracted a fungal desease that the other plant is resistant to. I consider 2 plants in the same pot to be generally problematic. You may want to repot the 'good' plant in fresh mix after a short root soak in a fungicide like physan 20. The other is probably best in sphag & bag until new roots start. I have had lots of fungal problems, and I read one study that found fusarium fungus in all of several samples of peat moss, a major ingredient of my mix. I am planning to buy some Banrot to incorporate in my mix to protect the plants from the fusarium, undoubtedly the major killer I have been working to save many plants from that has been running wildly thru my collection.