Arbor Day Tree PlantingApr 27, 2020valentine The first 1999 Arbor Day tree dedication by Girl Scouts. Arbor Day Tree Planting has been a tradition since 1999, when the Paonia Tree Board was formed. Tree Board member John Valentine with the Linden tree, explaining how to plant a tree. Fill with the soil from the hole, not too deep, don't over-water. Former Tree Board member about what trees meant to him. 2018 Arbor Day Planting in Apple Valley Park. The Apple Valley maple tree...later.