In honor of St. David as the patron saint of Wales, people sometimes wear daffodils in their lapels. The practice of wearing this spring flower (which usually blooms about March 1) is attributed to Welsh-born British Prime Minister David Lloyd George who wore one in his lapel in 1911 to mark the investiture of the Prince of Wales.
The Welsh also wear a leek on this day, in honor of St. David's advice that the Welsh soldiers stick a leek on their hats during a battle the Saxons to distinguish them from their enemies.
The leek and the daffodil are both national emblems of Wales.
- Little Black Book, Diocese of Saginaw