G. oderatum is native to Europe. In Germany, it is known as Waldmeister or ‘master of the forest.’ Traditionally in spring, before it blooms, its leaves have been added to wine to create May wine or Mai Bowle.
For a good discussion of the culinary uses of the herb in Germany — where it flavors jell-O and hard candy — see this article, “May’s sweetest herb,” in the blog Spoonfuls of Germany.
To see what other gardeners have put in a vase today, please visit Cathy at Rambling in the Garden. She hosts this Monday meme.