The common garden variety four-o'clock (Mirabilis jalapa) is also known as Marvels of Peru. They received their name because of their habit of opening in the late afternoon. It is not actually the time of day that causes the flowers to open, but the drop in temperature. The flowers close the next morning, except on dull and cloudy days.
Bet that's more than you wanted to know about that!
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Open in late afternoon, close by morning..pass them the memo! ;)
Bet that's more than you wanted to know about that!