Four O'Clock opens its flowers late in the afternoon thus providing the basis for the common name. Provide a light exposure of full sun and an ordinary garden soil. The tuberous roots can be dug at the end of the season and stored in sand in a frost free area. These can then be divided and replanted in the spring. Tubers can be used about five years before they need replacing.
Propagation is by seed planted directly into the garden or the tubers.
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