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Kilmarnock willow

The tree is in a large planter and earlier this year I took it out of the pot, trimmed back the roots and put it in new compost. It did well. Then last month all the leaves turned brown and fell off. I wondered if it was early autumn for it as we had a very early spring. Then all new leaves appeared and now I wonder if I will have to cover it when winter arrives. Have I or the weather confused it?
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Be aware that these plants are grafted onto a rootstock and tend to be short-lived and can die suddenly so avoid stressing it.
Be aware too that, as you've root pruned it, and it's had that bit of stress, it may struggle a bit, and then send shoots up from the original rootstock.
I live in west central Scotland - not where that photo is...