What are flowers which only bloom at night?

Answer:
Moon- or night-bloomers is the term for flowers which bloom only at night.

Specifically, such flowers tend to be fragrant and white in color. Examples include angel's trumpet (Datura inoxia), evening primrose (Oenothera macrocarpa), mock orange (Philadelphus coronarius), moonflower (Ipomoea alba), and night phlox (Zaluzianskya capensis).
First answer by Ginezumi. Last edit by Ginezumi. Contributor trust: 904 [recommend contributor recommended]. Question popularity: 2 [recommend question].