The definition of a tree accepted by science and the forestry industry is “A woody plant (arboreal perennial) usually with a single columnar stem capable of reaching six metres in height”. Less than six metres (21ft) of potential height is regarded as a definition is not absolute; gardeners contest the height threshold, some preferring five metres (17ft) and others choosing a threshold of three metres (13ft). It is likely that bonsai enthusiasts would entirely dismiss any figures suggested. Horticultural selections of dwarf conifers also fall into a grey area usually called “dwarf trees”
