Four o'clocks are often mid-summer bloomers. since I don't know where you are, it may be that it is not quite time for blooms there. You mention the foliage looks good, if this is the result of lots of nitrogen fertilizer, the plant may be directing energy into foliage instead of flowers. If so, stop fertilizing, keep them watered and blooms may soon appear.
Answered on July 21, 2011
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