Cestrum Diurnum is an erect evergreen woody shrub with numerous leafy branches. The branches, which are green and with well-marked white lenticels when young, fawn with age. The younger parts are covered with a very sparse glandular scruff.
The leaves are simple, glabrous, entire, alternate, ex-stipulate, ovate-lanceolate in shape with obtuse apex and obtusely wedge-shaped below. They are dark green above and pale below and are generally 5 inches long by 1.5 inches wide. The Inflorescence consists of a long axillary peduncle which bears short clusters of sweet white-smelling flowers, each cluster supported by a leaf-like bract. The individual flowers are sessile and maybe with or without bracteoles.