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They are very hardy. Mine is about 10 metres now, and is in the ground, having survived all our winters completely unscathed. But it is growing on chalk, in South Cambridgeshire. They like the soil to be very free draining, so their roots are never remotely waterlogged, as chalk provides.
You have to bear this in mind when keeping one in a pot, particularly when considering what medium it grows in and how much water you give it. Otherwise, the usual considerations apply for pot growing.This includes having a pot which is suitably large, lest the whole thing freezes solid. I don't think the tree in the garden has ever suffered all the soil around its roots being frozen solid, even in a bad winter.
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