The poinsettia is a rather recent Christmas tradition. Since it blooms at this time of year and has the red and green colors of Christmas, it seems like a natural fit.
However, poinsettias can also remind us of how God takes care of our needs. Jesus said in Matthew 6:25-30:
Don’t worry about our food or clothing (the things we need).
See the flowers in the field?
They’re beautifully clothed by God.
If God takes care of the flowers in the field,
won’t He take even better care of you?