There are more options than ever before to those wanting a tree in a small space.
Certain species, such as acer palmatum, otherwise known as Japanese maple, are naturally dwarfing.
Likewise, certain varieties are naturally dwarfing and will only reach a few metres. Others produce an columnar or fastigiate form, producing narrow tree.
Certain species vigour can be controlled by rootstocks. A tree with an M27 rootstock will only reach 1.5m high.
A tree's size can be controlled through pruning. Cordon trees are trained into a narrow columnar form. Standard trees are produced by clearing much of the lower branches, producing a top heavy tree.
A tree's size can be controlled through planting in pots, which limit a tree's nutrient uptake.