A friend gave us a Lilac Bush but its in a 3 gallon pot. We may be moving soon so would this plant be alright just leaving it in the pot? Where should we keep it? Lady said it would be fine outdoors all winter but wont it freeze? (not planted so roots would not be below frost line). The other 2 options are keeping it on our porch which is covered or should we bring it inside for the winter? Help!!! Thanks!!