This I can speak to first-hand, as I have three youngish Japanese maples in pots myself. They spend the winter in my unheated barn (which is well-insulated, however). I roll the potted trees into the barn on a hand truck, and when there are thaws of a prolonged nature midwinter, I check the soil to make sure the plant isn’t ever bone-dry. Last winter I watered them perhaps twice all winter long; mostly they remained frozen. My pots are large…so this provides additional insulation to the root system. I’m attaching a photo so you get the idea of what I mean by large.
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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.