Sizdeh Bedar takes place on the 13th day of the Persian New Year and marks the last of the celebrations for Norouz. It is customary to celebrate Sizdeh Bedar by spending the day outdoors picnicking with family and friends.
A custom of Sizdeh Bedar is to take the Sabzeh from the Haft Seen and throw it in a stream of water. This act symbolizes throwing away the negativity from one's home. Another tradition of Sizdeh Bedar is for single girls to tie a knot with the sabzeh and make a wish to find a husband in the coming year just before throwing it into the stream of water.
Lettuce and sekanjabin are traditionally served during sizdeh bedar. Sekanjabin is a syrup made of vinegar and honey.