"Don’t think you can plant trees in containers? Think again. 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."
Trees for small gardens: Olea europaea, the olive tree, grows slowly in our climate and this makes them perfect for containers. Pinch out the tips when the trees reach around 1.5m to keep them bushy. Photo by Paul Debois.