Hi Robert, Indeed it is still using the sun!
It’s also interesting for those of us in the UK to compare the flowers quoted in this article with those suggested for a similar purpose in some nineteenth century European gardens. There is a problem with latitude of course but an interesting article in a very early BSS Bulletin (Vol 91.3 p 4) suggested that some flowers on a sunny day in summer can (just about) be expected to open or close within half an hour of the same time each day. The opening/closing times for the flowers suggested in that article were: Spotted Cat’s Ear opens 6am African Marigold opens 7am Mouse-ear Hawkweed opens 8am Prickly Sowthistle closes 9am Common Nipple-wort closes 10am Star of Bethlehem opens 11am Passion Flower opens Noon Childing Pink closes 1pm Scarlet Pimpernel Closes 2pm Hawkbit closes 2pm Small bindweed closes 4pm White Water Lily Closes 5pm Evening Primrose opens 6pm It all seems a lot of work for just a few weeks of operation, the need for a pond for the water lily and to say nothing of the risk from growing bind weed! Patrick From: Robert Terwilliger Sent: Thursday, January 29, 2015 11:30 AM To: [email protected] Subject: New York Times article on Flower Clocks It's still using the sun to tell time isn't it? Planting a Clock That Tracks Hours by Flowers Bob -------------------------------------------------------------------------------- --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
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