The Legend of the Holly

When Christ was born in Bethlehem on that first Christmas night
A barren bush outside the stable blossomed full and bright
It bore a grim reminder of the crown he'd one day wear
It's prickly leaves foretold the thorns of sorrow he would bear
Amidst the green there grew strange fruit - small berries scarlet red
As crimson as the blood our savior was to shed
In honor of the Prince of Peace
A flower pure and white
Blossomed sweetly when the Lord was
born that holy Christmas night.

* Author unknown

Because of the symbolism described above Holly is truly a Christmas tradition.
Holly is an evergreen with waxy leaves that resist water loss when the soil is frozen in Winter. This is why it does not wither when brought indoors as a Christmas decoration.