I realized what was wrong with it; why it got so leggy and all the lower foliage died when left in care of a neighbor. It got overwatered. It was happiest when in the dry summer yard. So I took drastic measures a week or so ago. I chopped off all the stems, down to a few inches, and now I only water it once every two weeks. The best tender stems that I cut off got stuck into soil with some rooting hormone in hopes the cuttings would generate new growth.I don't think that worked. Only one piece still shows signs of life, the rest are dying.