Bulgarians celebrate Baba Marta (Grandma Marta) on March 1st to welcome the spring. As part of the tradition, they exchange Martenitsi, which are braided red and white threads symbolizing health and fertility. According to folklore, Baba Marta is an old woman whose mood reflects the changeable March weather. Wearing the Martenitsa's colors of red and white was believed to appease Baba Marta and make winter pass more quickly.