A bit of history
Wreaths have been used as jewelry or victory signs for ages by many different ancient cultures. But the wreaths used as decorations as we know now started in the 16th century. Christians adopted the wreath as a tradition, as the round shape symbolizes eternal life and the never-ending love of God. These wreaths were traditionally made of evergreens, which also symbolize eternal life, holly oak, and red berries. The red berries and the thorny leaves of the holly oak represented the crown of thorns worn by Jesus and the drops of blood that they drew.
Enough with the history lesson. As many of the old Christian traditions, wreaths are nowadays commonly used in all sorts of households regardless of religious beliefs.
Wreaths are actually becoming more and more popular as many people do not have the space to set up, or store afterwards, a Christmas tree. A full-on Christmas tree takes up a lot of space, and time and money to decorate. As we are now living busier lives in smaller houses, time and space need to be used efficiently. To still show the Christmas spirit we are seeing a boom in wreaths to hang on the door or put inside homes, which make Christmas a lot easier and more manageable. A wreath serves as a more practical alternative to Christmas decor.