Types of Non Fruit Bearing Pear Trees. Most varieties of ornamental pear trees have an erect habit and rounded shape. Different cultivars have different canopies from high to low. ‘Aristocrat’ and ‘Redspire,’ suited to USDA zones 5-8, have a cone shaped habit, while ‘Capital’ tend towards a more columnar mien and is suited to USDA zones 4-8.