Plank's Groovy Arbor Day Party is an annual party Jonny and Plank have every year to celebrate their favorite holiday, Arbor Day. It was first and only seen in the episode "Tween a Rock and an Ed Place." During the party they play several small, nature-themed, party games, much to Eddy's disliking. They would then become the "Arbor Day Daisy Chain of Woodland Buddies" who watch over the "Arbor Day Youngling" until it grows into a full grown tree, Plank would then play "Ode to Margot" and "Watson's Waltz" to the tree when it finished growing.