"Palms or olive branches should not be kept as amulets, or for therapeutic or magical reasons to dispel evil spirits or to prevent the damage these cause in the fields or in the homes, all of which can assume a certain superstitious guise.
Palms and olive branches are kept in the home as a witness to faith in Jesus Christ, the messianic king, and in his Paschal Victory." FROM CATHOLICSTODAY.ORG