The modern Christmas tree tradition dates back to Western Germany in the 16th century. They were called “Paradeisbaum” (paradise trees) and were brought into homes to celebrate the annual Feast of Adam and Eve on DEC-24. They were first brought to America by German immigrants about the year 1700.
Various types of spruce tree are also used for Christmas trees (including the blue spruce and, less commonly, the white spruce); but spruces (unlike firs) begin to lose their needles rapidly upon being cut, and spruce needles are often sharp, making decorating uncomfortable.
The custom of the Christmas tree developed in early modern Germany(where it is today called Weihnachtsbaum or Christbaum or “Tannenbaum”) with predecessors that can be traced to the 16th and possibly 15th century, in which “devout Christians brought decorated trees into their homes”.
The first recorded date of Christmas being celebrated on December 25th was in 336AD, during the time of the Roman Emperor Constantine (he was the first Christian Roman Emperor).
A few years later, Pope Julius I officially declared that the birth of Jesus would be celebrated on the 25th December.