In which country is the 'Christmas pickle' ornament tradition actually popular?

In the United States, the “Christmas pickle” ornament tradition is actually popular.

The custom involves hiding a pickle-shaped ornament among the branches of a Christmas tree. The first person to find it—usually on Christmas morning—may receive an extra gift or be promised good luck for the coming year. The tradition is especially associated with parts of the American Midwest and families with German-American connections.

Its supposed German origin is one of the most persistent Christmas myths. The ornament is often marketed as a German tradition, sometimes under the name Weihnachtsgurke, but the custom is largely unknown in Germany. Researchers generally regard it as a German-American tradition that developed in the United States in the late 19th century, possibly alongside the importation of novelty glass ornaments.

Several colorful origin stories exist, including one involving a Civil War prisoner and another involving Saint Nicholas. Neither has been firmly established. Berrien Springs, Michigan, even promoted itself as the Christmas pickle capital and held a pickle parade.