The Four O'Clock is a bit of an odd flower: Its different colored blossoms open in the late afternoon and close in the morning.
It's a very fragrant flower, so it attracts a lot of bees and humming birds. Four O'Clocksgrow to be a 1- to 2-foot-wide shrub by mid-summer and then bloom.
Eventually, the flower forms a black, carrot-like tuber that can be dug up in fall, stored in winter and replanted in spring.
Although they can take some shade, Four O'Clocks flower best in full sun on well-drained soil. Some people may get a rash from rubbing the leaves, so wear gloves and a long-sleeved shirt when working with the plant.
Using Four O'Clocks, you can have some fun creating a flower clock. Plant morning glories, daylilies, Four O'Clocks and moonflowers in one bed and the flowers will open in that order starting in the morning and going through the evening.