Four O'Clock are typically grown from large seeds, making them easy to
plant. They germinate quickly, and grow fast, up to 2-4 feet.
Sow seeds directly into the garden just before the last frost in your
area. Cover seeds with 1/4" of soil. Space plants 12 inches apart and
thin to two feet apart.
In addition, Four O'Clocks are propagated by it's tubers. Tubers should
be dug up in the fall and stored in the dark, in damp peat moss or
sand.
Four O'Clocks prefer full sun, but will tolerate partial shade. Note
that in partial shade they may grow lanky. They will do well in rich,
well composted soil as they are big eaters. Keep soil moist. Add a
general purpose fertilizer once or twice a month to encourage vigorous
growth.
Good Luck!!