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Every seventh flower on aEvery seventh flower on a plant vine is female. Flowers open one to two hours after sunrise and female flowers are receptive to pollen throughout the day, although usually pollination occurs by noon. Flowers close in the afternoon and never reopen, pollinated or not.  

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?