Tibouchina is definitely not hardy, and will have to be overwintered indoors. The trick is where and what conditions you can offer it, if there is no greenhouse. I have not tried, but generally try to keep non-hardy things barely growing (a cool bright room, not a lot of water and no food). A potted specimen won’t reach its in-the-ground potential, and besides, you will probably be doing some pruning as I expect it will hate you for bringing it indoors. I wish I had more specifics, but have seen very little of authority on this topic to share.
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.