Any kind you want. As a child, we would go to the woods and cut a cedar tree for our Christmas tree. However, cedars are prized for their beautiful rot- and insect-resistant wood, so they are not as prevalent as they used to be. Replanted pines are replacing them in the South. Also, trees not native to our state are being brought in and sold as Christmas trees. They are lovely trees and people are buying them at Christmas markets today. I think people are now picking trees for their beauty and not worrying what kind they are.