What do four o'clock flowers look like?

Four o'clock flowers, or Mirabilis jalapa, have five petals and are trumpet-shaped in colors of white, red, yellow, pink and bicolor, according to About.com. They have a vanilla scent and bloom from late afternoon to evening.

Four o'clocks are a perennial that need at least six hours of sunlight for good blooming. They are hardy in USDA hardiness zones from 7b to 11. The flowers begin to bloom in midsummer and continue blooming throughout fall. The scent of the flowers makes four o'clocks attractive to hummingbirds. The flowers are a great addition to a patio for nighttime scent and flowering.