Although it is still not a tradition practiced in all countries, the blessing and use of palms for the liturgy of Palm Sunday is believed to have originated in Germany during the 8th century. Palms then soon became incorporated into Catholic liturgical tradition.
But because palm branches are not easy to obtain in certain European countries, a substitution is sometimes made. In Italy, many churches use olive branches. In other nations, spruce branches or pussy willows are used. As a result, today is known as Willow Sunday in England, Poland, and Lithuania. In countries such as Hungary and Spain, flowers are used in addition to palms, therefore giving this pre-Easter mass the name of Flowering Sunday.