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:
Cephalotaxus harringtonia 'Fritz Huber'
Magnolia yuyuanensis, Pick Up ONLY
Osmanthus fragrans 'Tea Olive'
Osmanthus fragrans var. aurantiacus