Sunflowers’ Bee-Attracting Ultraviolet Also Helps Retain Moisture

Natalia Mesa at The Scientist reports in late summer, from southern Canada to northern Mexico, seas of sunflowers bloom in fields and farms. The flowers, which grow at the top of long, one- to three-meter stems, appear to us to be somewhat uniform, with bright yellow rings of petals adorning brown irises. But bees and…