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:
Abies alba 'Pendula' (firma)
Abies concolor 'Wintergold' (firma)
Abies koreana 'Alpine Star' (firma)
Abies koreana 'Horstmann's Silberlocke'
Chaenomeles × superba 'Cameo'
Ginkgo biloba 'Autumn Gold'
Ginkgo biloba 'Elmwood Pillar'
Juniperus virginiana 'Taylor'
Picea orientalis 'Losely'
Syringa x "Red Pixie'