Overwintering Gingko Biloba

I purchased a lovely little Gingko tree this spring that had five leaves. By the end of the summer, it had grown substantially larger (almost doubling the number of leaves). The leaves have now fallen. How do I overwinter this little tree-in-the making?

I am assuming you are keeping the tree indoors and possibly wish to bonsai it to have it remain indoors. Keep it cool - at about 10 degrees Celsius (50F) and just barely moist, until it starts to sprout again. In our greenhouses this happens in February, when the higher sun warms the greenhouses during sunny days.