Bake and cool tree-shaped cake. Place on foil-wrapped cake board cut to size and shape. Prepare for fondant by lightly icing cake with buttercream.
Tint fondant yellow; roll out 1/8-in. thick. Cover cake with fondant, gently smoothing fondant with hands.
Pipe tip 3 leaf green buttercream icing outline vines. Add flowers with dots of icing. For butterflies, pipe tip 3 orange bodies and insert wings.