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Pulmonaria (lungwort), like some other plants, changes its flower colour, presumably as a message to bees. The flowers start off by opening pink and gradually change through violet to a bold blue. If you look at the background to the top photo, you can (I hope) make out the deep pink unopened buds, while, just behind the foreground flowers, there are the shrivelled blue remains of a dead flower.
I’ve mentioned flower colour change in previous posts: Lathyrus vernus (spring vetchling or spring pea) changes colour in the same way, going from a pale magenta-pink to a soft blue, while Nigella damascena flowers changed from white with blue veining or a pale blue to a much deeper blue.
Not all pulmonarias have this colour sequence. There are now cultivars which mature to a much softer lavender-blue. Others change from red to a softer pink and there are some that have pink buds that open to pale blue or white flowers…lots of tempting choice for the gardener!
The flowers of pulmonaria are small, but the variation in colours on the plant at the same time make them more attractive and worth the effort of a close look. As a plant that can begin to flower in late winter, those small flowers are particularly valuable to the first bees visiting the garden.
It is believed that the colour-change in the pulmonaria flowers allows the plant to let the bees know which flowers are freshest and still have plenty of nectar. That ensures that bees are likely to visit those flowers that are still to be pollinated. This strikes me as clever evolution and particularly good design by nature. I’m sure the bees must appreciate the convenience and saving of their time and effort too! 🐝
























