If you visit Boston's iconic Public Garden frequently, you might be familiar with the Garden's stunning willow trees that line the lagoon. Many have been there for decades, and that was the case for one of the most beloved trees of all: 3-D-09, which was recently taken down due to disease after growing there for more than a century, watching the city change dramatically around it. Liz Vizza, President of the Friends of the Public Garden, returns to the show to talk about the tree's history, why it was such a standout, and the Friends' plan to preserve the willows that remain.