How to care for and plant your indoor/outdoor holiday tree:
Purchase your tree now and dig your planting hole before the ground freezes. Keep your tree outside and water as needed, keeping in mind that plants in containers tend to dry out more quickly than ones planted in the ground.
When you are ready, gradually introduce your tree to indoor temperatures by moving it to an unheated garage or porch for a few days before bringing it inside. Check for insect egg masses or other unwanted critters.
Find a cool spot for your tree, away from ducts and heat sources. Place the container in a tub to minimize watering mess. Keep it indoors for up to 10 days and water as needed.
After the holiday, move it back to the porch or garage for a few days and then plant it in the hole you prepared. Water after planting and whenever the ground thaws and appears dry. And then enjoy the fact that you are providing important habitat and food sources for songbirds.