I have two Hindu Rope Plants. I've grown them before with great success. I planted them and they looked beautiful for about a month. Suddenly, beginning closest to the roots, the leaves began looking shriveled. The problem then goes to the next leaf and the next. They're starting to lose the leaves at the base. I can't see any signs of an infestation. I have a Jade Plant next to it, that is thriving and producing new leaves that are bright and beautiful with no leaf loss. Can anyone give me a clue what might be going on and how to arrest the problem and save the plant?