Answer: I have heard of the "planting clock" and a number of gardeners over the years have asked about it, but I've never found a design that has plants that open at different times in the day. I suppose you could construct one roughly on the idea that 4-o'clocks open in late afternoon, flowering tobacco opens towards evening and many other flowers such as daylilies open in the morning. But for an exact design, I'm sorry I don't know of one. I'll keep my eyes peeled for more information.
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