If it has been outside all this time, I would probably allow the leaves to fall off naturally, allowing it to go dormant. Then I'd place it in an unheated garage where it will remain dormant until next spring, watering only once a month or so, just to keep it from completely drying out.

The growth is still soft so you should not let it get frosted or freeze until it can harden its growth.
Cold weather will speed up dormancy but I think you should move it into your garage at night when the first couple of cold periods arrive because it still looks pretty green.

Omni,

It is neat how fast they grow...very rewarding.

Thanks bamboo!
I'm really hoping that it fruits next summer :-).