I grew this lovely plant for the first time last year. I planted three and was very pleasantly surprised when two of them returned in the spring. In the meantime, I read an article in Horticulture magazine about overwintering plants, and it said to dig up Tibouchinas and store them in the basement. I read the article several times and I think what it was saying was to just lift the plant, rootball, dirt, and all, and set it on newspaper for the winter with no water or light or anything.
Does this sound right to you? If we have a real Zone 7 winter this year, I seriously doubt they would make it through even with a good mulch, so I would try this method if I felt confident it would work.
Has anyone ever started these plants from cuttings successfully? If so, how did you do it? At least with cuttings I'd have a plant come spring, although the above method would probably give me many weeks of head start.
Any advice will be appreciated.