Breaking of the glass is a ritual a part of the Jewish wedding ceremony symbolizing the falling of the temple. This signifies the finality of the ceremony, which gives greater meaning to their wedding.
Tree Ketubah & Judaica - wedding of Josh & Kim of TN. mazelmoments.com "Tree in the Garden of Love" Ketubah by Naomi Broudo, Ketubah.com. http://www.ketubah.com/ketubah-gallery/product-details/index.cfm/id/4999/Search/Naomi-Broudo/Tree-in-the-Garden-of-Love