From “What to do in December” on Natural Gardener’s website:
https://www.naturalgardeneraustin.com/what-to-do-in-december.html
Consider purchasing a live Christmas tree for the holidays. Arizona Cypress, Aleppo, and Italian Stone pines can often be found this time of year. A trick for watering these trees indoors is to place ice cubes on top of the soil, making sure there is a sturdy saucer underneath the pot. Avoid keeping these trees indoors for any longer than two weeks. To allow the tree to adjust to the abrupt change in lighting when moving outside, place the tree in shade first for about a week, then move gradually to more and more sun. Finally, plant your tree outside in a sunny area with very good drainage. Pamper it when planting by using bone meal or rock phosphate in the hole, and by following the regular watering with some seaweed solution for the first few months.
HOT Urban Gardening Coalition 