The line between whether a plant is a "tree" or a "shrub" is sometimes very thin and quite blurry! We use the following criteria to decide which type applies to a certain plant:
Buxus sempervirens 'Unraveled'
Cedrus deodara 'Feelin Blue'
Chamaecyparis lawsoniana 'Wissel's Saguaro'
Chamaecyparis obtusa 'Hage', Hinoki Cypress
Cryptomeria japonica 'Vilmoriniana', Japanese Cedar
Diospyros rhombifolia, Diamond-leaf Persimmon
Distylium x 'Spring Frost'
Ilex crenata 'Dwarf Pagoda', Japanese Holly
Ilex crenata 'Piccolo', Dwarf Japanese Holly
Ilex crenata 'Sky Pencil', Japanese Holly
Osmanthus fragrans 'Apricot Echo'