Combine cake mix, buttermilk, vegetable oil, and eggs in the bowl of a stand mixer. Place cupcake liners in tins and fill 2/3 full with batter. Bake 14-16 min at 350°. Carefully remove from tins and place on a cooling rack to cool.
Place 2 1/2 cans frosting in a mixing bowl. Add a small amount of orange icing color and stir together to make orange icing. Add more orange if you prefer a darker color. Place remaining frosting in a mixing bowl and add a small amount of leaf green icing color. Mix to make green frosting; add more color, if desired.
Cut a hole big enough to place the 1M star tip at the bottom of your frosting bag or in one of the corners of the ziploc bag. Add orange frosting and pipe onto cupcakes in a circular motion. Place a pretzel stick in the center of each cupcake. Cut a tiny hole in one of the corners of the sandwich bag. Add green frosting and pipe vines onto each cupcake. Serve and enjoy!