This large shrub is called a mock orange because its white flowers are like the flowers on an orange tree.

ROMANTIC KNIGHT™ Mock Orange is a large shrub that grows to about twelve feet tall and wide. It has a clumping growth habit with long branches that arch gracefully. During the spring it is covered with flower spikes that carry numerous scented white flowers that are up to two inches in size. Once the flowers have faded this shrub is a useful green backdrop for summer and fall flowering plants.