There are a few flowers that bloom on a working person’s schedule. That is, they keep their petals closed in a tight nap during the normal 9-to-5 workday, then as you arrive home at the end of the day they decide to strut their stuff. One of my favorite night bloomers is the old-fashioned Four O’Clocks (Mirabilis jalapa). The dime-sized blooms open late afternoon and will remain open until 10am or so. You can find these in solid colors (magenta, yellow, white, red) but my favorites are the “broken colors” with two colors of flowers on the same plant and sometimes even on the same bloom.
Four O’Clocks are easily started from seeds. The seeds are large, about the size of BB’s, and are toxic if eaten. During their first year, Four O’Clocks form an underground tuber similar to Dahlias. Freezing weather kills the plant but the tuber stays alive underground and will send up a new plant every year thereafter in Zones 7 and warmer. You should cut off the frost-dead stems at ground level before spring arrives.
If you notice the leaves becoming pale around mid-season, apply liquid fertilizer. They will green up again in a day or two. In the Mary Snoddy garden, the white variety always gets taller (48") than the other colors (28-36"). I’m not sure why. Occasionally a harsh thunderstorm knocks the plants over. When that happens, I use electric hedge trimmers to apply a serious pruning. The plants rebound and will be blooming again in two-three weeks.
The plants are heat and drought tolerant. They are happy in full sun or part sun. The flowers have a distinct pleasant fragrance, almost like soap. Best part of all: they are deer resistant and not troubled by diseases.