While palms have religious significance, they are also used to guard the household. Placed above the front door they protect against fire & all evil.
In Poland early in the morning on Easter bits of palm, willow, & blessed eggs are placed in fields to bring good harvests. There are many regional variations between Easter palms in Poland. In the south of the country, willow branches of various lengths are tied together, in the Kurpie region, the entire length of the Easter palm is often decorated with flowers.
As with most Christian symbols & traditions, this origin can be traced to pagan religions that held the willow to be endowed with beneficial qualities, & to symbolize enduring life, & rebirth.