Exochorda 'Snow White'Exochorda serratifolia Snow White is a compact, deciduous tree sometimes referred to as Pearl Tree or Pearl bush. The name is a reference to the buds of pure white that appear all along the arching branches in the early spring like so many masses of pearls, which then bloom into large white flowers drooping slightly beneath the branches. The flowers are resilient, coping well with the lingering frosts that can sometimes carry on through to Spring.