Today is Arbor Day and plenty of our neighbors will spend the weekend planting new trees in their yards. But what kind of tree should you plant? Shopping for saplings in a nursery is nice, but just like browsing catalogue photos on your iPad, you really don’t get a sense of what a tree will look like in the real world. You need something more like a showroom. With that in mind, we invite you to visit the Utility Arboretum at the Urban Forestry Center in Portsmouth.