Potted boxwoods offer formal elegance with little maintenance. This large American variety creates a living wall in a line of concrete planters. Plant Boxwoods in Pots I could use to disguise septic tank
Deck tree - This golden maple makes a beautiful potted tree in this tall terra cotta. Maybe a Princeton Gold Maple "Acer platanoides" or a Golden Full Moon Maple "Acer shirasawanum 'Aureum'" (small, shade)
Don’t think you can plant trees in containers? These birch trees are placed in large containers, and because the root ball is kept from growing outward, the whole tree remains smaller and more manageable.