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:
Chamaecyparis obtusa 'Well's Special'
Cryptomeria japonica 'Globosa Nana'
Leucothoe axillaris 'Dodd's Variegated'
Magnolia figo 'Hagiwara Everblooming'
Magnolia yuyuanensis, Pick Up ONLY
Mahonia 'Beijing Beauty'
Osmanthus fragrans 'Tea Olive'
Pieris japonica 'Temple Bells'