it will defoliate on its own soon. As advised above, you should be very careful how you overwinter given you just collected it. Once the leaves fall off I would suggest keeping in an unheated garage or shed if possible. If you must keep it outside find a very protected area...as little wind as possible and bury the pot in the ground and mulch up around the tree. I'll sometimes place an old nursery container over the tree once its mulched in and dormant for added protection.